Malicious PDF — malware analysis report

Static analysis result for SHA-256 112b21ca839c169c…

MALICIOUS

PDF

77.7 KB Created: 2021-03-15 12:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d1a82073641160267a95fd266c301a37 SHA-1: ff75efbcde847a3ec635179f377b7a5fec69dee9 SHA-256: 112b21ca839c169c2eba429bb0d80f81b4f28ac27c9a23eeb2eb8e727c9c136a
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 designed to manipulate search engine rankings or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/wix?keyword=sql+server+convert+float+to+varchar PDF link annotation
    • https://lifefoxametuzov.weebly.com/uploads/1/3/1/3/131383893/b6e937f27f84d.pdfIn PDF document text
    • https://cdn.sqhk.co/lezenelu/N4Sggge/please_answer_me_in_korean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6022bab9231ec.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/336898.pdfIn PDF document text
    • https://mugebixivezir.weebly.com/uploads/1/3/1/4/131484268/9ea28189.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/gijnXja/wolutanemidubaper.pdfIn PDF document text
    • https://cdn.sqhk.co/worupageke/pyEfgi9/primary_school_teacher_appointment_letter_sample.pdfIn PDF document text
    • https://kenigoxiwe.weebly.com/uploads/1/3/0/9/130970014/suxedujeroji.pdfIn PDF document text
    • https://mitamegupep.weebly.com/uploads/1/3/2/3/132302953/c8ff12c54.pdfIn PDF document text
    • https://fenutirixe.weebly.com/uploads/1/3/4/6/134640366/fac3b415b36.pdfIn PDF document text
    • https://cdn.sqhk.co/finefamokevo/jggcngg/kitebuperazuvigerufenot.pdfIn PDF document text
    • https://xaviguvugunaji.weebly.com/uploads/1/3/5/3/135313722/4557009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fe70f5f1a6eb.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/gidus-vowatof-zawijijenozitez-nefobita.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/4271609.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_79c412fc37004bf59633076d9867b88e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/390783144.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/48258411600.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_d5357e2aac444611811627a26ddc37fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/jodubol.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/81039503058.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/infective_endocarditis_guidelines_esc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 5000 bytes
SHA-256: b114551d533052656c0af2d0d2a239438539df10a769271282d78db02e4a80c0
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 12836 bytes
SHA-256: 7afc79ce7f9822f27c76dc255fb155bc6336672e17a1ead04e8f78b69d543562
font_02_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3