Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f212472e15b2804…

MALICIOUS

PDF

88.0 KB Created: 2021-06-09 23:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c14a9597413e33ac4a7956d257286f87 SHA-1: 0a4a519abe5bdd827c37bea89e4040634a4c9a50 SHA-256: 4f212472e15b2804752ede5ad283419918042625ec33e73b307ab815d99abc03
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or SEO spam document. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The presence of a link farm and the overall structure strongly suggest a malicious intent to distribute or promote other content.

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
  • 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://queure.ru/pbw?utm_term=passive+voice+exercises+pdf+with+answers PDF link annotation
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/9198376.pdfIn PDF document text
    • https://mivetemadika.weebly.com/uploads/1/3/4/4/134471856/xojoguva.pdfIn PDF document text
    • https://wilogodomagifaw.weebly.com/uploads/1/3/4/7/134727865/titesima_vikivo.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/wesowasedojazala.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/dcc5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6036c7eeed60f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370547/normal_60b34611b1205.pdfIn PDF document text
    • https://wubajepetodol.weebly.com/uploads/1/3/1/6/131606368/9fbd50d8b.pdfIn PDF document text
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/4662403.pdfIn PDF document text
    • https://kakexesasag.weebly.com/uploads/1/3/4/6/134614155/2638834.pdfIn PDF document text
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/fobiw.pdfIn PDF document text
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/932771.pdfIn PDF document text
    • https://suvewuvasalu.weebly.com/uploads/1/3/4/7/134762181/xidedonakofo_sinazifelebane.pdfIn PDF document text
    • https://jetasiduneka.weebly.com/uploads/1/3/4/5/134586997/6547061.pdfIn PDF document text
    • https://kuwepokipeluzil.weebly.com/uploads/1/3/0/9/130969114/puborawajofar.pdfIn PDF document text
    • https://govenovu.weebly.com/uploads/1/3/4/7/134701044/pupinigew-fopoze-dolelujikekobi-febepudikanir.pdfIn PDF document text
    • https://fenejetamop.weebly.com/uploads/1/3/4/6/134697978/puguxu.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/zirazu_xutuzonubifevuj_gutudok_makek.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/d2fd16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d8e83d-a9c9-4de6-9992-91df14fb6525/85312795833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc14ffa4-c878-4dc3-87cc-59743f304da0/pci_express_ht2000_motherboard_specs.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_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 5432 bytes
SHA-256: de8ce52868759a942bb951d0773b08af33c617d152326f1d24e57f93a95d3da8
font_01_sfnt_off00012d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3D 11200 bytes
SHA-256: ebdd5bfea14b36a51f1cacd6e5c3b0c23c444c5bb5dc934800fc5ee038bc5a8c