Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1dc943fd4b2edf…

MALICIOUS

PDF

72.4 KB Created: 2021-05-09 16:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 32efcaeaf86faced1298cb6cf1d5e4fe SHA-1: 22a42d6e2e8b601dc6f2a1940ada8e85d9feda27 SHA-256: fd1dc943fd4b2edf8387c4e7aaab708a4cd59d1cc1c96284c6e668cc97e43dea
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The presence of ClamAV detection and ML classifier flagging strongly suggests malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, potentially used as a lure in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=first+things+first+i%2527m+the+realest+meme PDF link annotation
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/zixetixa_xowar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483337/normal_6003dd55603f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_604112babd320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_6064a8028a12d.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/velidizux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_6013cb3c4cdf7.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/rurowevejobuto-sasumuzinud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_6050798bedf50.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/gunadebisabidoturo.pdfIn PDF document text
    • https://salupoxegiras.weebly.com/uploads/1/3/5/9/135961269/2966863.pdfIn PDF document text
    • http://fekijijiz.iblogger.org/sociological_theories_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_5fd8a2a6d035a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_6020ff3d1bc43.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/78908982467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fd6668ec3080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_601d8b772a69d.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/669a97c5-b93d-4d5a-842a-751f970d62c0/44164051460.pdfIn PDF document text
    • http://sasebuza.epizy.com/dr_bob_and_the_good_oldtimers_book.pdfIn PDF document text
    • http://goxafebo.myartsonline.com/benzodiazepine_withdrawal_treatment.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/astrologia_vdica_livros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d766477-e50f-4ac1-8dbf-58c7b93dfb22/fofekifi.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/7291389907.pdfIn PDF document text
    • http://fazajupozapufo.rf.gd/kythira_weather_report.pdfIn PDF document text
    • http://tolamepaduxeju.rf.gd/how_to_sew_a_hood_pattern.pdfIn PDF document text
    • http://vumebef.epizy.com/3044637789.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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 5168 bytes
SHA-256: c1666bf3b5747a7888be7b8e287bae46cc09c37f8a20e83869a8733b595fc115
font_01_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 11228 bytes
SHA-256: a9d85359ce5c310211189c0d76b9b237b373d07a1cb0cae7e327b9c7b8cd6126