Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe6267d85ad71aa…

MALICIOUS

PDF

78.3 KB Created: 2021-01-03 05:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e3c8ad1e41e511b566fb107f874b2eb6 SHA-1: 64fa5b06a5296e46f1cd02b05fc735e16d934c93 SHA-256: efe6267d85ad71aa14d2365af4983a5753ab1d140c8abdb08ce2d910a9dc873d
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 0.9997

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://trafffi.ru/aws?utm_term=fiske+guide+to+colleges+2019+list PDF link annotation
    • https://cdn.sqhk.co/pufowuvikij/LI3BgcK/49418484479.pdfIn PDF document text
    • https://kogatakuzomaw.weebly.com/uploads/1/3/4/4/134444425/zadegavane.pdfIn PDF document text
    • https://cdn.sqhk.co/gikasiful/J4Fjhhf/zeganirapavo.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/jghdhiY/super_stylist_hack_apk.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/bikopi-sudazibarax.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/mulegebuweg_burewafano.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/WWBO7e5/paul_hardcastle_19_music_video.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/phighcD/49355088955.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/Rjbidaw/claw_machine_game_buy_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/giiYjar/30226149744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dbfa1b4-1288-4ed7-b521-c9ec58f64aaf/jefferson_starship_red_octopus_youtube.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_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 5304 bytes
SHA-256: 9e513a1d7e6099987ea58d2d7e276405444bd994eb87f0539c50bd9ad00fb6f2
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 10892 bytes
SHA-256: 1646dc420c5790aa29c97b101de8381438cefbc6bcca90bfbfdd9c4bf4361cd3

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