Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f5c3ffabc9b511…

MALICIOUS

PDF

83.1 KB Created: 2021-02-03 15:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0f216e0d9bc9bc8ac5d9b196486a6e65 SHA-1: 566b89242f4cfab610921ecff4ed2f57c06eda50 SHA-256: d8f5c3ffabc9b5113b39ad5c47f39ef47182f3f6a046c604d121ca2b3915377a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spamming operation. The primary purpose appears to be directing users to external resources, potentially for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=big%20data%20analytics%20platform%20strategy PDF link annotation
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/dc774eeca1a7f.pdfIn PDF document text
    • http://wugafis.66ghz.com/58749695753.pdfIn PDF document text
    • https://zijolafazul.weebly.com/uploads/1/3/0/8/130873795/mesodajadukabelafir.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/kovopapenosa_duvawapulesupo_fuleluli.pdfIn PDF document text
    • http://nalomojup.22web.org/font_chaparral_pro_bold_free.pdfIn PDF document text
    • http://jadivaza.iblogger.org/zebuluxofenelerugukovan.pdfIn PDF document text
    • https://rozuguki.weebly.com/uploads/1/3/0/7/130775318/geronezeturigi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366032/normal_600755e34ccd8.pdfIn PDF document text
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/tedazefukagebitoki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5ffb311d92446.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/sutunedanexev.pdfIn PDF document text
    • https://voviteri.weebly.com/uploads/1/3/4/9/134904749/1a107f0fe4874.pdfIn PDF document text
    • http://fofafik.iblogger.org/waruxepodekora.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://s3.amazonaws.com/megujobemegor/cisco_esa_c395_datasheet.pdfIn PDF document text
    • http://bopufadepop.epizy.com/67866359138.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/android_web_browser_source_code_github.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/kiev_nightlife_guide.pdfIn PDF document text
    • http://pibumox.rf.gd/physics_and_maths_tutor_dna_technology_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/46337077147.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/tavivekujimaxizivotivifeb.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_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 5412 bytes
SHA-256: 59a505cebe8de168455917ad8701be5c2a29ed90353a650b77b95b8fe1e35ade
font_01_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 11032 bytes
SHA-256: 980a451e18c95efe828d16170a6684580e9be0624ddf8e4979438be257784f19
font_02_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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