Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb70741363ced56…

MALICIOUS

PDF

89.3 KB Created: 2021-04-03 13:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2738aa366f7f40262e92e8d2b94ac243 SHA-1: 53d881b45ae27b028fa090f6b0779e887546acaa SHA-256: edb70741363ced562e7e66e14a58292dd8d4878bc4653aa06428b5f1a46d113a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/award?keyword=automator+mac+pdf+to+word PDF link annotation
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/liduw-pafakokomuf.pdfIn PDF document text
    • https://jodejivosarixu.weebly.com/uploads/1/3/4/3/134314211/guganeg.pdfIn PDF document text
    • https://pazopoxe.weebly.com/uploads/1/3/5/2/135293382/paxeni.pdfIn PDF document text
    • https://gudejebomuxuvu.weebly.com/uploads/1/3/1/8/131856108/lijazapidovi_jitaz_wirejiwis_jorakoxaramug.pdfIn PDF document text
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/jaran_purepeteroxum_jagukinim_fogorazugugikop.pdfIn PDF document text
    • https://vumopiwerelo.weebly.com/uploads/1/3/4/7/134730258/8514180.pdfIn PDF document text
    • https://jokesekarizav.weebly.com/uploads/1/3/1/4/131407558/nubojuxuxenotawovo.pdfIn PDF document text
    • https://gavizixuf.weebly.com/uploads/1/3/5/3/135334805/jukotibanibop_jezabefexoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_d988f1a06d3942eda0afd4851a606db8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wopari/xavegidugowodekasivu.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_5dce7294ab3f40f89b2291855a3e7aa7.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_7bf82cd117a046a4995ca6d255ec8e61.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_c89a3dff470e4a78a7932949c9c61a6e.pdf?index=trueIn PDF document text
    • http://bufiziwo.rf.gd/51912302859.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_fa4447d92f0340b6a07a73a63bdf438a.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_60a47cb4c95d4e63a47eebad398ad1bc.pdf?index=trueIn PDF document text
    • http://zurutoraxavifes.rf.gd/construction_contract_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/pavajegijazabo.pdfIn PDF document text
    • http://kodosalepixalan.epizy.com/physics_gre_flashcards.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/appendices_in_a_report_example.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_dfd9a455a43547898ec0af7f644348ba.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_dd54402ca1b54e0f988de60d103a367f.pdf?index=trueIn PDF document text
    • http://xegunapajom.epizy.com/article_in_apa_format.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_1b056cc61ebe4eff8d32b24ddf20a1cc.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 4784 bytes
SHA-256: 4dcd9139b1bf82eea7d85a79a0194ffede44a51d4389316e83314cdd0464d32c
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 11316 bytes
SHA-256: b7434b18d04042ff5c22912ba9d19317517a92bc26244d5c47514b38abcd1124
font_02_sfnt_off00013131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 16416 bytes
SHA-256: ace7ded0588703fcbae27ee667d799cfe7370f1ba098a699f0308c67a12ce946
font_03_sfnt_off0001476b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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