Malicious PDF — malware analysis report

Static analysis result for SHA-256 42accd278e0546e1…

MALICIOUS

PDF

77.1 KB Created: 2021-03-31 22:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0df5fcd023a0d07987c56d438b95183f SHA-1: 2530dfa79da290f96f6a7b1711b65d768f39b67b SHA-256: 42accd278e0546e1aab1f5c918ee631202f5d326d2af31ed2f76e8f088a504f3
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 detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jottigo.ru/award?keyword=bolt+and+nut+size+chart+pdf+metric PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410714/normal_605259a10724f.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/rerazel-xikedalanalo.pdfIn PDF document text
    • http://freshka.fun/craftsman_dls_3500_price5oa6s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fd02f640314f.pdfIn PDF document text
    • http://letnesil.xyz/sebasujimusolvn5jo.pdfIn PDF document text
    • http://teachersaid.fun/how_to_calculate_drop_down_list_in_excel11owc.pdfIn PDF document text
    • http://fastcreditreport.info/credit_union_information_security_risk_assessment_template1xt8o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475580/normal_6009d1c014fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_60338c81c55d5.pdfIn PDF document text
    • https://tegikalom.weebly.com/uploads/1/3/0/8/130874380/e664aaee55e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_6031ddefe43ea.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/3815bcd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_603176faabb3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_6024a9d5dd75b.pdfIn PDF document text
    • https://nubukagogurug.weebly.com/uploads/1/3/4/4/134495847/5181335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_605c406dc0fec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fe1fbfe2f1be.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/e44558e4-c20a-403d-9bbd-7bee170ee550/htc_sensation_xl_price_in_pakistan.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_1a2ba4b4e0354c8e9f678f95981de9d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da50280e-3b43-43ce-98c9-10a890707e59/newomejave.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_b74e4c39687e49639c379b733c49cb8c.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_f7d197a8ee0747e9b7d563376b83bd28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4590a473-8c82-497f-917c-a9457475dea7/papukepiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429f1833-599b-43f6-ba77-5bb34b4554bc/what_protects_us_from_the_harmful_ultraviolet_rays_of_the_sun.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_eb709a3653694f6b957b73b1fcf423bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2461052-c571-4d06-9abb-3bd53cd62511/is_greenworks_going_out_of_business.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_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 5492 bytes
SHA-256: 846744d7a87b395ffcf82aaee431b6fc8df493567338132a295a25932dec8e36
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 10876 bytes
SHA-256: b571d9cd4eb8167c1618ffcae23bc198580d8868e0722432de33bd7e6f68b97a