Malicious PDF — malware analysis report

Static analysis result for SHA-256 62116810295dcfe2…

MALICIOUS

PDF

79.5 KB Created: 2021-03-31 02:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5cf4ea89d165e461a49a701adb82af4f SHA-1: 57d64b8cc0a2cdf41f85c6c8bd8b78f0266625c6 SHA-256: 62116810295dcfe2e0503848ef8c835bcb9cf5059f5340795db7e5618fe8df89
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=foxfi+apk+full+version+free+download PDF link annotation
    • https://lebosipob.weebly.com/uploads/1/3/4/0/134040403/dorur.pdfIn PDF document text
    • https://rozinefowo.weebly.com/uploads/1/3/4/5/134576391/a60af800b63726d.pdfIn PDF document text
    • https://nosekixiruwem.weebly.com/uploads/1/3/1/3/131380944/2743984.pdfIn PDF document text
    • https://ranadapibefa.weebly.com/uploads/1/3/0/8/130874213/6668324.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/01d832d.pdfIn PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/9866556.pdfIn PDF document text
    • https://powifamule.weebly.com/uploads/1/3/4/7/134757347/658a79.pdfIn PDF document text
    • https://kurotasa.weebly.com/uploads/1/3/4/4/134494220/zopepunifuzu.pdfIn PDF document text
    • https://nulabelavomeviz.weebly.com/uploads/1/3/1/4/131413951/3425394.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/gufafiziga.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/ssc_mcq_answer_sheet.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/1978_mercury_9.8_weight.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/8999843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_9b3f9657230f4448a74796113d8b3aa6.pdf?index=trueIn PDF document text
    • http://wumafopid.onlinewebshop.net/avancemos_2_unit_resource_book_answers.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_cb75a6414bf1440fa76cf0778cf10dfb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8388e8-1e0a-4d0b-b445-2f36ed1691ea/fluval_305_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f987b3f-fa46-45e7-b919-e2e9ed83e574/52698157176.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_fc45a417c2a8442fbcfc6f602d5c0fcc.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_ca049fac56624813bd83d38d5e002094.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_be67d3765cd047f7aebd299c215bb7ed.pdf?index=trueIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/apprendre_a_dessiner_manga_livre.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 5272 bytes
SHA-256: 6114cf09e097203cc323940f6489105d813ec41a2d64c3a02243b5ac3d476714
font_01_sfnt_off00010990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 11304 bytes
SHA-256: 8bd7514c5ec4b3abc5df3974ce89b2e8be79ac94542d5c3c0837714437a84984

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