Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa2c8dfe39cae13…

MALICIOUS

PDF

82.0 KB Created: 2021-03-03 20:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1a096bddbbc0c0a201b35fb9af01ef93 SHA-1: 8f57f84cdedc98b748d887f2c487a6015c3ee4c7 SHA-256: cfa2c8dfe39cae13017aa08d8b7cca34bfa8e8a787841efe62b42fc6291a890d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=arduino+uno+pinout PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4859821/normal_60394a99bf5dc.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/7050404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_60206f92bfc7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_603de363b9db9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5feb6a0d30e05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ffccd0637045.pdfIn PDF document text
    • https://gokejubekilebu.weebly.com/uploads/1/3/4/3/134376129/0826a02775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fc7ef6a5d7d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417419/normal_5fcc5fd25d831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387811/normal_5ff5bd80c57f1.pdfIn PDF document text
    • http://fonareru.22web.org/zifumasikujepok.pdfIn PDF document text
    • http://5gusevshop.space/sony_xplod_12_costi0ggc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_603161b4cd495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487201/normal_5ffd0d449ba18.pdfIn PDF document text
    • http://how2clever.com/71280935908057b8.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
    • http://filezigubala.rf.gd/that_evening_sun_faulkner_sparknotes.pdfIn PDF document text
    • http://nisegup.epizy.com/how_to_calculate_energy_of_excited_state.pdfIn PDF document text
    • http://tubafuwasaxa.epizy.com/microsoft_office_2016_64_bit_installer.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_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 4284 bytes
SHA-256: d639dbdb2e79ec3e5c9833c2c6ecb56babd474d76c57dc8d67c6c2df007ce523
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 11680 bytes
SHA-256: e92241acc2d0d28728352fc5eb0ac6180fe089f16d5014af5332067e8945a6fc
font_02_sfnt_off00012b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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