Malicious PDF — malware analysis report

Static analysis result for SHA-256 813b5f9d35e32174…

MALICIOUS

PDF

78.8 KB Created: 2021-04-26 22:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 79c8ccddc64d03b844adc0b5d3f85036 SHA-1: afda695abd133e2ce1f9ce1eecc104ef83c74d5a SHA-256: 813b5f9d35e3217404601347a5ae466156cabdb9354b1839aae30e7ec5abe710
206 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents hosted on disposable or SEO-focused domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure suggests an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ponafet.ru/strik?utm_term=philips+norelco+aquatec+at880+manual PDF link annotation
    • https://fexegidonowagi.weebly.com/uploads/1/3/5/3/135325594/3461081bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_605fb886a0262.pdfIn PDF document text
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/6299026.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/rugixosewoxebuv.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/nonawolunako.pdfIn PDF document text
    • https://keziripar.weebly.com/uploads/1/3/4/5/134522929/bugazarowi.pdfIn PDF document text
    • http://powezikunuzumi.iblogger.org/public_speaking_skills_training.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/5586491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5fecd0d5aea57.pdfIn PDF document text
    • https://dafepigog.weebly.com/uploads/1/3/4/6/134605944/cb4f3942d14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487409/normal_604926ce97858.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/notibafim.pdfIn PDF document text
    • https://rupilobeva.weebly.com/uploads/1/3/0/7/130775598/dalen_lopaziduka.pdfIn PDF document text
    • https://xomarexisu.weebly.com/uploads/1/3/4/7/134701616/mibituweranunozofaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_606371d50240d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_5fd7942aeede7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_603000658faa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483359/normal_5ff1942c1fc60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479237/normal_6007384e3f070.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/xaguzimilamopavumiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalixonawi.atwebpages.com/tujenugovosidoz.pdfIn PDF document text
    • http://mubelurodi.rf.gd/jatexuzotexesibalugep.pdfIn PDF document text
    • http://datidalumoz.rf.gd/how_to_use_p-touch_electronic_labeling_system.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/what_are_examples_of_behavioral_interview_questions.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_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 5636 bytes
SHA-256: 0d7171741ff43dc48d1f82f01450e9ea2fd9cd5d82f010cad4871a4763dadd88
font_01_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 10680 bytes
SHA-256: 6fe2acee2c0c567626f760d2834e7d140168e83eff034197d4c766c4e5c44485