Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9abae23b98609a4…

MALICIOUS

PDF

74.5 KB Created: 2021-05-06 22:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7a34f76eaeb2a596d5e90023cf668cac SHA-1: 948fb7bed3cf812c528a0b2b4b096d8da5e1e1c8 SHA-256: a9abae23b98609a4dc92e54910a70c3abd669cd593d46b006ed58541da1d8527
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be intended to trick users into downloading a password-protected archive, a common tactic for evading gateway security. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://midufefew.ru/strik?utm_term=battle+angel+alita+anime+online+dublado PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459060/normal_60237f9bd1448.pdfIn PDF document text
    • http://videohost.space/zividozojazigult2qg.pdfIn PDF document text
    • http://zahlungsservice-ch.site/how_to_make_your_own_website_to_sell_stuff_for_free7pgwy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_6016c4e4ce657.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/21722678883.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/LKwbhey/89254760925.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzikewed/a4gghgR/fuladupajesegiki.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/91123860765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_60370208864ff.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/heTwgm0/pobewujugan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_6069efd0183ea.pdfIn PDF document text
    • http://wobifotos.mygamesonline.org/christian_premarital_counseling.pdfIn PDF document text
    • http://djami.ru/xedojakudogokakanabemexcu4i6.pdfIn PDF document text
    • https://cdn.sqhk.co/tegasipitif/jggj51h/plunder_pirates_best_legendary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410717/normal_6067aca1748c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486537/normal_60348456eb8d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_6062b74e6915b.pdfIn PDF document text
    • http://new-volosi.ru/326431481584r96m.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/ieYckij/seesaw_class_vs_seesaw_family.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/487211950890bq47.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/baby_bestiary_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_602ad782974da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_1629b67e71ce4760afc0cce14fcb231d.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_31487255968b41788e21bfa469d851d9.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_a2f241430d04431ab22824c22ba59191.pdf?index=trueIn PDF document text
    • http://lufopudizomuv.atwebpages.com/systematic_theology_by_louis_berkhof.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_be1cd74adff2474c8d13b70d9c071632.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_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 5060 bytes
SHA-256: 9d1d418289204da4ca2d54d6680a3b1c849a49a2a9f86f01ea556dcd3dce9981
font_01_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 12108 bytes
SHA-256: 4d8ca8269e41ac521a607c9e51d60efeeb0c494671a731fcdcdf6e226dda2c28