Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed31d75beed6ff5…

MALICIOUS

PDF

129.1 KB Created: 2021-04-08 03:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 969c71d211ca5f15292f532d51a009c8 SHA-1: e705539736b5e871946dfe5e776f5b1f46261065 SHA-256: 1ed31d75beed6ff561f992eb6a1e3a209f6eb379b3e839c46f12bc216ce5e561
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a technique often used for SEO spam or to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_LINK_FARM heuristic confirming the link farm behavior. While no scripts were extracted, the structure and URL patterns suggest a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gimoguvi.ru/123?utm_term=michelin+food+guide+singapore+2018 PDF link annotation
    • https://solakozejifu.weebly.com/uploads/1/3/5/3/135347449/2476052.pdfIn PDF document text
    • http://gilekapurepo.iblogger.org/write_a_paragraph_about_yourself.pdfIn PDF document text
    • http://kujudunoberij.22web.org/wedetusuxiladodetigidi.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/6723560.pdfIn PDF document text
    • https://kagukemo.weebly.com/uploads/1/3/4/8/134884413/1906163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_602972c97dd85.pdfIn PDF document text
    • http://lyudi23.ru/indoor_golf_hitting_mats_and_netskhski.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_6068d0b24116e.pdfIn PDF document text
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/67664ba0850a282.pdfIn PDF document text
    • http://termometr-medikal.site/68677466914cge7x.pdfIn PDF document text
    • http://save50.pro/which_part_of_canada_is_less_coldfotq5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_60217e203fba4.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/wasuravurazaparixuktto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizogebinide.rf.gd/golunazazaronuti.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_4805e8f86176443e8da9b2d7d6c5a688.pdf?index=trueIn PDF document text
    • http://dawivek.rf.gd/88972221664.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_9ee48458d4af45d38f441f1a8919f3e2.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_77451752d654495aa315b7d7fbd2cfca.pdf?index=trueIn PDF document text
    • http://xakilapug.epizy.com/new_guideline_for_pap_smears.pdfIn PDF document text
    • http://riruvilanofaz.rf.gd/star_wars_encyclopedia_1998.pdfIn PDF document text
    • http://xidajar.epizy.com/descargar_la_biblia_de_estudio_dios_habla_hoy_en.pdfIn PDF document text
    • http://lavebaku.rf.gd/84265431831.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_88a63b6538214478bec55968a828ecb5.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_ea9a56d216584901adc05d85bc70fff2.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_off00015b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2A 20456 bytes
SHA-256: 9228687c61198faa870799a85ec84c98d2cec60752e5fe2fcfd47c9166d62f9b
font_01_sfnt_off00019c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C87 5944 bytes
SHA-256: c0276ea1ad6a1ecfd5043bc9f1970d82fd9641f607ffdcc798e46650a5934eb2
font_02_sfnt_off0001b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0CE 14624 bytes
SHA-256: 98cd8d671a782f84eaf7da1574ebdee1469928f78b972209af3dfd9e498579d3
font_03_sfnt_off0001def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEF5 16216 bytes
SHA-256: bf13900e28cb1d1a335440cc7e9ee212d64002b8207505a2a5edc1e5590be4e6

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