Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5368522203f6eb…

MALICIOUS

PDF

69.1 KB Created: 2021-03-20 16:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 20c9d22ea246adeb8f0832b80813b33b SHA-1: 12d19666693611499c53ad325600a977a9fdc369 SHA-256: 0a5368522203f6eb1a2974838c3c1fce118d45aa55c5311ee80a912d918ffb0a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=bits+of+paper+lyrics+pdf PDF link annotation
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/dibeperav_niwovebonutab_suragez_togobem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5feb670816d6a.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/dPTiaie/nusim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_602fb4f8f1168.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/6f854b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_5fdad13f8fd98.pdfIn PDF document text
    • http://mawifit.iblogger.org/buffalo_animal_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/ifxhjAd/photo_studio_near_me_for_us_visa.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/iMgijiV/strategic_planning_sample_ppt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_5fda9351becf2.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/davisafasawiraz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_e4b609d373b34e8588daf4713bb574e9.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_48459cbc5135495e8fe013cda7c1fbcd.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_a5deb8db9efe4ccc858dc1a302858284.pdf?index=trueIn PDF document text
    • http://zitilola.rf.gd/xojunimo.pdfIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_b13cad57bc944c308905fef8e79419c0.pdf?index=trueIn PDF document text
    • http://pubamawuxa.epizy.com/hayward_wisconsin_weather_report.pdfIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_856e2d22e51b49af924d73662cfe600b.pdf?index=trueIn PDF document text
    • http://jojomuge.epizy.com/deriwezutogugekosokov.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_919cea690e5945f9bef438ceca9ee1fc.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_7b1bbac48597451992d7467e5f381a6c.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_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 5300 bytes
SHA-256: bd8947acb35cdf158fc41c417d3d6ced87accdae3bdf57c3414ef6ac263a5823
font_01_sfnt_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 10300 bytes
SHA-256: 2df861ad98f792fbdb8b94015c38ace4a59e1213ac182df4e9c4ef3ac6597146