Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ed2b57d42c2ac2…

MALICIOUS

PDF

97.7 KB Created: 2021-05-12 19:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86ceba0f9f86dd8e88ef91aa20a7fa05 SHA-1: d5e7fdee94714ed6883659510069fc2284eee6f1 SHA-256: 42ed2b57d42c2ac2ced984fb602b4e57576e8aa58b15499a5e99d04f5d80cc29
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely for SEO manipulation or to redirect users to malicious sites. The presence of multiple unknown URLs further supports this. Although no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/strik?utm_term=best+wifi+extender+for+verizon+fios+2020
    • http://tapidiv.medianewsonline.com/mivomejirazejupewet.pdf
    • http://jakusavu.sportsontheweb.net/chlorination_of_alkanes.pdf
    • https://susulipazelavig.weebly.com/uploads/1/3/5/3/135335994/fe6406a1.pdf
    • https://sedidumorasu.weebly.com/uploads/1/3/4/5/134507492/makojurifas.pdf
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/naberedufixof.pdf
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/e0ce69b96.pdf
    • https://nesurufaratetud.weebly.com/uploads/1/3/1/4/131408203/dotil.pdf
    • https://tikemedatimi.weebly.com/uploads/1/3/0/7/130776462/1517613.pdf
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/3ef76c5870528a.pdf
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/a2b48890.pdf
    • https://zikowajemaje.weebly.com/uploads/1/3/1/6/131607239/fedasufukirevi.pdf
    • https://xajimamu.weebly.com/uploads/1/3/5/3/135314586/3720432.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_908724254e83427080a61f64a12b3152.pdf?index=true
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_0b72bd56c04b4928b7dbc6f488e03fe3.pdf?index=true
    • https://s3.amazonaws.com/zarusegibitumet/daxebomijilulanozovovi.pdf
    • http://vidugozu.atwebpages.com/vw_polo_6r_service_manual.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_49997f8d119347bd94875742f391be78.pdf?index=true
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_cab2534d59084b989635c5b182cac648.pdf?index=true
    • https://s3.amazonaws.com/jedobufudajewu/washington_dc_covid_restrictions.pdf
    • https://s3.amazonaws.com/vaxebisapesi/gemufotofedebugonera.pdf
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_ccfc3a5122444bd89c966f6f536d3f7d.pdf?index=true
    • https://s3.amazonaws.com/wopari/liziw.pdf
    • http://rixigor.onlinewebshop.net/public_finance_harvey_rosen_free_download.pdf
    • https://s3.amazonaws.com/jixerubowi/happy_birthday_wishes_pics_free.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_off00013dbf.bin
1deb8819dae9e04729787683c7f43dad0e14c703f07ff2d387516a9c85428b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBF 5252 bytes
font_01_sfnt_off00014fd9.bin
1c80db88c15155621b851e6d8e501ae572f831915f34495090228fc7dc1dde82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD9 12060 bytes

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