Malicious PDF — malware analysis report

Static analysis result for SHA-256 8773640d17db4791…

MALICIOUS

PDF

72.9 KB Created: 2021-03-16 22:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0d6c5d0493460e352d0be4abb315d72c SHA-1: 9751ebb76ce515b61ed3c464f031a5572716c31e SHA-256: 8773640d17db4791a8999f407ffc06dea63f71b3471336cfbaedf026bb6a88a9
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate this malicious intent. No scripts were extracted, but the overall structure points to a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=filsafat+behaviorisme+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480899/normal_60059e99855c6.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/jegifefizuzagevefuririsum.pdfIn PDF document text
    • http://igclienteam.com/vepunagowulaku4z4t4.pdfIn PDF document text
    • http://gamedv.design/oracle_sql_mcq_questions_with_answers4da5v.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/8403774.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/zawove.pdfIn PDF document text
    • http://vipmanmarket.space/towigosijh7yx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_5fe8bc8cd3ac4.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/fakiso.pdfIn PDF document text
    • https://vadutivolojogo.weebly.com/uploads/1/3/0/8/130813650/nejinebemilokirafe.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/mepuniw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_1e9b3a4fc8dc42139949000e2870cb3b.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_13dfee7443fd427b80ca10395bb86fe5.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_2adce6dbea89417ca8f6c78f5cf806f4.pdf?index=trueIn PDF document text
    • http://sogivuwe.onlinewebshop.net/the_golden_goblet_chapter_1.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_ecee51e48ead4246aee450c584c7b8fb.pdf?index=trueIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_73f540e4c0464d98b819eba9ca6af2aa.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_a4ec5dcd006148fda2ab73f8f2d47646.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 5436 bytes
SHA-256: a1f76016e9cc379f86d1162159f28a497df1f4eba0066e12bd29b520a9bd6ecd
font_01_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 10848 bytes
SHA-256: 1ce9ece676f993a75a0d1fcaf78727636860cdfd52febff3deadfe1db2b6774e

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