Malicious PDF — malware analysis report

Static analysis result for SHA-256 0545b9392651f1f0…

MALICIOUS

PDF

69.5 KB Created: 2021-06-03 10:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b43f136d06c10a78e7b30cb75cfef51 SHA-1: 7c5ac30e9654b23c9fc7480743fbe4d5d5b17656 SHA-256: 0545b9392651f1f0439039c62c3121b820f5b2ac0e93c9a500db8be39545022f
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to "Haworth chair adjustment guide", which is likely a pretext to drive traffic to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://pixomot.ru/pbw?utm_term=haworth+chair+adjustment+guide
    • https://rujajibagakolu.weebly.com/uploads/1/3/5/3/135303982/femidisek-tapenedezi-janimu-zurobu.pdf
    • https://lezigumaluneluw.weebly.com/uploads/1/3/1/4/131454696/3513705.pdf
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/wefefot.pdf
    • https://cdn-cms.f-static.net/uploads/4472766/normal_60163afd44a0c.pdf
    • https://jodudetejad.weebly.com/uploads/1/3/0/7/130775984/7350294.pdf
    • https://cdn-cms.f-static.net/uploads/4425921/normal_60b817d4cb208.pdf
    • https://mabiredozex.weebly.com/uploads/1/3/4/4/134482212/2437529.pdf
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/5624256.pdf
    • https://cdn-cms.f-static.net/uploads/4479675/normal_605d688a7db95.pdf
    • https://cdn-cms.f-static.net/uploads/4388174/normal_604b8e23ebcbb.pdf
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/3815319.pdf
    • https://wixugowodekawa.weebly.com/uploads/1/3/1/4/131438135/tozifi-dujawifusi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nuxawakaxaz.pbworks.com/f/tuvizunibejubiver.pdf
    • https://uploads.strikinglycdn.com/files/affcbc1c-9f71-4414-ae8f-50e28b8176c2/wemafuputadupulot.pdf
    • http://fajopab.pbworks.com/f/software_testing_interview_questions_and_answers_download.pdf
    • http://kuperuxowix.pbworks.com/f/4589229332.pdf
    • https://uploads.strikinglycdn.com/files/2cdbbc98-f66a-4ac3-a4f2-46ae0b790b88/canon_powershot_sx100_is_sample_photos.pdf
    • https://uploads.strikinglycdn.com/files/30c98671-921c-4296-8716-57bd79603cd9/braven_brv-1_manual.pdf
    • http://didaneguk.pbworks.com/f/50989855438.pdf
    • https://uploads.strikinglycdn.com/files/715fe0a4-a613-46f5-b9c2-7520a3ec0d8a/40200232114.pdf
    • http://fulusivijomu.pbworks.com/f/81727681591.pdf
    • https://uploads.strikinglycdn.com/files/3e26a08f-4c1b-48e5-a758-e850a4298491/how_to_change_an_infrared_thermometer_to_fahrenheit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d369.bin
73d77a46d82c7963f61320c46fdd32035c988d16a0526b44af75e80b271ef8a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 5452 bytes
font_01_sfnt_off0000e5da.bin
7e16f453f18b4b4b42e9d66d443bbc9ccd3e33e3d532a008aab6c7f9c3eedadf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 10132 bytes

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