Malicious PDF — malware analysis report

Static analysis result for SHA-256 03da4c3e7d5e4115…

MALICIOUS

PDF

69.7 KB Created: 2021-03-08 13:27:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8d42774463c13824eff875f9fa57a7f0 SHA-1: 924ad2b44b546736acbda93831bd09409f2c2891 SHA-256: 03da4c3e7d5e41153eb951d97e882ae90ea22f24b9aaf40fe6f3c0fbc0ec40f3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for phishing or malware distribution.

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://vilenefex.ru/wix?keyword=wes-state-mortgage+in+eugene+oregon PDF link annotation
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/3313573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5ff1e91a9d265.pdfIn PDF document text
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/91bbb07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_6013a15e1e565.pdfIn PDF document text
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/jivaxel.pdfIn PDF document text
    • https://vobakedipevurot.weebly.com/uploads/1/3/4/6/134661611/vobil-lerabazo-daxidavupas-pazet.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/hi-point_firearms_9mm_pistol_with_leather_holster.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5ff130a775206.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/6911340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_6028a40f5eea5.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/136f7.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/towewulojaj-tuputazuninupe.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/89787e56674439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_60001370b8b09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://raziwisubuza.rf.gd/gopro_hero_6_black_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/fender_princeton_chorus_red_knob_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/digraph_th_worksheet.pdfIn PDF document text
    • http://dizutobasuxolom.epizy.com/thalassemia_major_management_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/wofadomoxowuzodudezawudel.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/17275098806.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_6f4a5c737ff24a72af0b63ce3a50b3eb.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_67deca52e77c4f47972c4c9100734555.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_b786c8ba0a6c40dc83f56dee13fb2c91.pdf?index=trueIn 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_off0000d505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 5020 bytes
SHA-256: c1905e93170f6c7ae49475ad6e73a624921ea4d5821bd8add6bd0a5e339b63c3
font_01_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 10336 bytes
SHA-256: 793a7ccade546aa07457eecba349d9a9da766f1e0dc4d6cfb91cda185639f0a1