Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b3bba8c89d334d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 03:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afe98b880287fadd50b3a80e017630e6 SHA-1: 7cffa17a60d1dab67f3a2fe15197e3abf84843a5 SHA-256: d2b3bba8c89d334dc430ea7f60a51b7c0f6eaf57eab4fed1303ebd571b0f1f3a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://zajinet.ru/wix?keyword=right+at+home+dallas
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/ritupulabew.pdf
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/tafowilinozikib_kebos_xobalaw.pdf
    • https://cdn.sqhk.co/remigalakefo/Siegiib/talujajero.pdf
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/zazavaponinamilu.pdf
    • https://cdn.sqhk.co/nujamuxeg/AjeKib5/dropwizard_github_example.pdf
    • https://cdn.sqhk.co/xataruzepape/ccKghif/94052144974.pdf
    • https://cdn.sqhk.co/ziratede/jh7iibq/9325026986.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/517e0ddd-461c-47e2-81a4-97d2ca379df5/where_the_wild_things_are_free_download.pdf
    • https://s3.amazonaws.com/polojuliragam/53729514071.pdf
    • https://s3.amazonaws.com/zopenave/asthma_guidelines_2017_sri_lanka.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_93623124594e4c149d85c078f82e84bb.pdf?index=true
    • https://s3.amazonaws.com/paxunu/8552850929.pdf
    • https://uploads.strikinglycdn.com/files/0e8e2336-3b6a-4121-b943-ef19513131a6/82849064410.pdf
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_0514036fcbf244c09ca88520c7c5cf5a.pdf?index=true
    • https://s3.amazonaws.com/lazesej/naletumet.pdf
    • https://s3.amazonaws.com/najipavez/ms_word_return_address_label_template.pdf
    • https://s3.amazonaws.com/wikurixobelu/rubaravesetuke.pdf
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_a37a970254d64c78af5b95fd9f0565df.pdf?index=true
    • https://s3.amazonaws.com/fonazuzixagizir/61991759544.pdf
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_2fecbd1f20e84c7a81798efdac1c2d97.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf89e90d-ec2f-4dce-8e71-57cd2705d213/rangers_apprentice_book_2_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/3c3896cb-590b-4474-8504-4a736b03c292/juraxinox.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/kuvajegekunogesavewema.pdf
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_68580d7231a84880bd54fb25bd25e3b3.pdf?index=true
    • 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_off0000ee16.bin
56ccd605077527dc458e1ef996e2a22f03449e498803e1fb913ea5f9c95b7bbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 5148 bytes
font_01_sfnt_off0000ff7b.bin
927a9711b635f25484d6fe0dbc88cc52c5b42c490a6c114b62ed3e6a1b579274
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 10592 bytes