Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94ae5d1a4cc3dcd…

MALICIOUS

PDF

80.7 KB Created: 2021-02-26 13:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3db1a1f2bedbcb1404a0f7c6f9819207 SHA-1: ccfc0475e07ab592634f2c576fe8b0e7afb3d269 SHA-256: d94ae5d1a4cc3dcd6783bae4b114202c964e16df994f212b064b3af3a2fc82ee
206 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, along with the malformed stream, confirm its malicious nature, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/123?utm_term=empi+300pv+manual+pdf PDF link annotation
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/zilulufar-duxopuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/hdicIx8/does_he_love_me_or_no_tarot.pdfIn PDF document text
    • https://cdn.sqhk.co/davunosedepa/Mhhidgc/gubujijuvo.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/xororijivipax.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/is_there_a_season_3_for_sword_art_online.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/2465934.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/RijRhGC/6111645472.pdfIn PDF document text
    • https://sabumamopadav.weebly.com/uploads/1/3/5/9/135957329/lopujafugexagefe.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/agcgdbb/56967141364.pdfIn PDF document text
    • https://bobebizup.weebly.com/uploads/1/3/1/3/131381471/patibekizodomenelase.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/zen_in_the_martial_arts.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/69e7fc.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/2336445.pdfIn PDF document text
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/fixagarimig.pdfIn PDF document text
    • https://bazeneta.weebly.com/uploads/1/3/0/8/130813787/lerawozikopotanexuka.pdfIn PDF document text
    • https://vejamepune.weebly.com/uploads/1/3/0/7/130776484/salewoba.pdfIn PDF document text
    • https://zekupepub.weebly.com/uploads/1/3/5/9/135992873/zivanufelifivo-sofonete.pdfIn PDF document text
    • https://fiduludebiwoki.weebly.com/uploads/1/3/4/3/134317875/10fcc856170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/mewifilimobuxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/bedadabimadezam.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 3656 bytes
SHA-256: 9636f4257d32d2ea44c415b713c07bea6625a65babb6ab8c2ce4b548bbf2f9a4
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 5236 bytes
SHA-256: 44911a2f1c7f3d7b65ce8c6bc2da17a14da1be60ad02c596808413cb0940d6dc
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 10496 bytes
SHA-256: df35fb03cbd9206be19cd40d787fd439c5bfb77563f23f6160bf43943853d05b