Malicious PDF — malware analysis report

Static analysis result for SHA-256 a770616ef6dc6363…

MALICIOUS

PDF

80.7 KB Created: 2021-04-09 00:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c20355f63efb10d69e26668b00abfc97 SHA-1: b87195f358e4fe631fdf7f1939b9877523f3bcdd SHA-256: a770616ef6dc636366d029e886f5f10bf178ef1cb793eff0b66d0598d5b51514
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/strik?utm_term=weight+watchers+scale+error PDF link annotation
    • https://gefatute.weebly.com/uploads/1/3/5/3/135345711/bawafewikamike.pdfIn PDF document text
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/dufunoj-newudidet.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/hhfRicS/sosalurulafuxapabobob.pdfIn PDF document text
    • http://1offpark.xyz/beauty_and_the_beast_2017_full_movie_download_in_tamil_dubbedovk36.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/rubenosaziradu.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/jtaKVgd/carrom_superstar_mod_apk_rexdl.pdfIn PDF document text
    • http://xitumuxaditef.iblogger.org/kijejit.pdfIn PDF document text
    • http://iglivesupportteam.com/fallout_4_script_extender_1.9.4jqfau.pdfIn PDF document text
    • https://papuxivosep.weebly.com/uploads/1/3/4/4/134491017/ad52a18.pdfIn PDF document text
    • http://brosbass.com/85757192237x3lzx.pdfIn PDF document text
    • https://xixunogada.weebly.com/uploads/1/3/4/3/134343035/pevisafobi.pdfIn PDF document text
    • http://tryraisins.pro/how_to_use_farberware_double_flip_waffle_makergo2bp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixabaxoji.epizy.com/arm_workout_routine.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_c0e9c2310c464beeb6abd35df45180b3.pdf?index=trueIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_3b44a3de00954901a7170f414a53b4af.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_1fb8edc2dc744a64a5849a8381efb1b4.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_46e4046a606440fd861aff96c88a5983.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_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 5168 bytes
SHA-256: 4a7a24e7e8e1fbc1da05d8d54353bf7d44d756a9c18ffb43074bc99ade367e16
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 10768 bytes
SHA-256: aef153438dd404c1922b060059c62f8ae43062822da52391d223b211a411338f

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