Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee011467c722b212…

MALICIOUS

PDF

83.1 KB Created: 2021-04-05 00:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fcb64aa8dea7c33f752e0f1ae64aa024 SHA-1: d80cad2dad023c20bd0462ba3b0cedd23f5f086b SHA-256: ee011467c722b212c89346809f3d4397bb996d3c6f858c8b22af4b494e15a34b
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a high likelihood of malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/award?keyword=adjectives+english+french+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479938/normal_603edeb342a97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458625/normal_5fe1e9f8dbd62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_605bfefacf4d0.pdfIn PDF document text
    • https://jodavetofa.weebly.com/uploads/1/3/1/4/131438562/ccb4f4.pdfIn PDF document text
    • http://juilopkiretlo.ru/who_played_the_president_in_national_treasure_book_of_secrets82dla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6065bfb486a3a.pdfIn PDF document text
    • https://gefererasixo.weebly.com/uploads/1/3/4/7/134749514/roluvafuzes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_601ab7bd8a366.pdfIn PDF document text
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/modom-tinuziwarasaxog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_6028add435a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_60323ab614cb6.pdfIn PDF document text
    • http://mscredit.info/vidofomiw5n2qc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_604ef65f5e8de.pdfIn PDF document text
    • https://pedudevapo.weebly.com/uploads/1/3/4/7/134719514/xafemigas.pdfIn PDF document text
    • http://alex-chekalev.com/11265407544a7ttu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462056/normal_6001b893030d9.pdfIn PDF document text
    • https://likixadukevagal.weebly.com/uploads/1/3/4/7/134700169/megupinefejefuzun.pdfIn PDF document text
    • http://itawomen.fun/lugumuxebugij1k9c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_6036baaa34423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_6035464b88a0e.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/121a71d7-003a-4f30-a078-9f1ff342f56a/bayesian_data_analysis_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b04316-e36f-471f-8ffb-3c2a0c3f742d/boss_ve-2_vocal_harmonist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48739a7-a145-4f25-ad33-b86c26e4f2d4/staples_one_touch_stapler_how_to_load.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8674be4-1e3d-48e2-8ca8-fabb069d4ab3/meaning_of_robert_frost_the_road_not_taken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e34ad74-9b86-47c7-bf58-70968158548d/28639970519.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_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 5332 bytes
SHA-256: 41c558883c9d4d77ce9a1666932d9eaa192c28b827933693df528a38c33ee1b2
font_01_sfnt_off000117d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D1 12212 bytes
SHA-256: 713229e4f9a73e4174d570ce1476b01a51bb05e251e58d6301efa206b2e84f56