Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae68bf53985b71e8…

MALICIOUS

PDF

77.6 KB Created: 2021-06-02 12:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6e7b5ddebe0655e29104419ee561d5e0 SHA-1: b3341dc98c2e37c981f984986038998544c715a8 SHA-256: ae68bf53985b71e81d3436c3ce630e35bcf017c93bf3baaf5f7114f9ec5c908b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users.

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://smidgel.ru/pbw?utm_term=before+after+grammar+exercises+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445114/normal_600907ceb48d8.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/tubeduvutawika.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/bizipogomapoxiw-vijok-wolababuminaba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5fdd852d32fa8.pdfIn PDF document text
    • https://bifotuvimutojuz.weebly.com/uploads/1/3/0/9/130969437/4197604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_605df65aa0366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_605ff94d7e1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477408/normal_606550c8a94cf.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4378381/normal_60b1b2cf08a66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/46665060489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5829ad33-782e-4044-97a6-580ae2a61549/zojiwewe.pdfIn PDF document text
    • http://veweran.pbworks.com/w/file/fetch/144457287/10355555493.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/vawokiwizukakalezaromitem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8793abda-6e70-4cf4-af8c-f2604882d22d/duwetilun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90aa28e-9b27-4769-beb6-3d16ae961cee/20168144240.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/33027342440.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/twilight_saga_full_movie_watch_online_in_hindi_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8d34be-238b-4de1-a808-11c02fd28de4/24588607694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5662fa99-c04f-4ac3-89c4-fba83e42396a/88489613920.pdfIn PDF document text
    • http://pitevaj.pbworks.com/f/52925819865.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 5560 bytes
SHA-256: e3411dc818c00ad9b734265df94c905cfe733d91969fa88ded61f237c59e8cf4
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 10760 bytes
SHA-256: 3625fd699f28944f0d899d6b85fb3c67f850ba4813383f6089aa42260fd24e06