Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cb92f269654d84…

MALICIOUS

PDF

79.5 KB Created: 2020-12-30 18:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 05233a64c8887ae340d1429df8bf9a6b SHA-1: 21996027a66515c4236d1a379a95d3118b3cf466 SHA-256: 77cb92f269654d8436a1551bbbe8d2d6fea683a17a0605855b4cf5d4fd1ab411
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing trojan. The document contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The primary attack pattern involves directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=clue+hunter+trousers In PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/4589730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_5fadd9d67a0f3.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/3358c4ea5b.pdfIn PDF document text
    • https://vefekigut.weebly.com/uploads/1/3/4/3/134391246/6048846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416675/normal_5fc59d3acbc27.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/surepakedubujenuzu.pdfIn PDF document text
    • https://naratejog.weebly.com/uploads/1/3/2/6/132682615/rovumo.pdfIn PDF document text
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/6267106.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/nowonovege/valumisutopaganesivezuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9979f74f-84b3-45b5-ad11-8dcd01776b6a/gugakozu.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/givizerer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ade6686-41f8-4b1d-a5d2-590282078bd6/cartoon_cat_licking_screen_gif.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010577.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10577 25808 bytes
SHA-256: 8558f249c296503cef514b3863ae6be68fb641e9c60a10e7947cf185df0dbb1e
font_00_sfnt_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 4468 bytes
SHA-256: 1d6fc37b7de599fd6b16c1109370bcd93438bd7527d3a2b54965aa897e31a706
font_01_sfnt_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 11108 bytes
SHA-256: 5aed0159358757f99872e1149884786c84dadd2db22cabff2b43142da5afc668

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