Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe40df8524e7144…

MALICIOUS

PDF

79.7 KB Created: 2020-12-27 02:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd83e78252af6078eb77504debef0b25 SHA-1: 139da5501f29dbffbb4cf59f934545e182ff8aea SHA-256: 8fe40df8524e714404af6badbaefae14949c8fa7e641551e8e9ad0b83541bddc
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming operation. The primary external URI, 'https://trafffe.ru/123?utm_term=average+speed+of+a+plane+landing', is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly indicate malicious intent, likely for distributing unwanted content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=average+speed+of+a+plane+landing
    • https://cdn.sqhk.co/lixejudazeza/yhhs0e2/boxhead_zombie_2_player_full_screen.pdf
    • https://jozisilefetaj.weebly.com/uploads/1/3/4/4/134476246/wuduzasefevot.pdf
    • https://static.s123-cdn-static.com/uploads/4459323/normal_5fcb978b8ea53.pdf
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/fd78ef39cb.pdf
    • https://cdn.sqhk.co/vibifexode/ITujadn/93335346164.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vipinib/verikudur.pdf
    • https://uploads.strikinglycdn.com/files/b8755308-35bb-4f7e-9620-96e251b7794d/83711853178.pdf
    • https://uploads.strikinglycdn.com/files/5e95ac86-60b7-4fea-8f96-f10e5c81b18b/minecraft_jar_download_1.13.2.pdf
    • https://uploads.strikinglycdn.com/files/c6fe3324-7a68-415f-9010-53a509314f27/gifigop.pdf
    • https://s3.amazonaws.com/rebesudanolo/crystallize_violin_sheet_music_free.pdf
    • https://s3.amazonaws.com/guxosa/organic_chemistry_1_for_dummies.pdf
    • https://s3.amazonaws.com/tugumeb/desagon.pdf
    • https://uploads.strikinglycdn.com/files/53689293-3695-40af-9229-b607df1f72e5/rohs_smart_bracelet_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4f.bin
7d396df7c540d684574f76fdbfc2c3a56730a94ec0fe960e3d0095942d5f1d82
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 4968 bytes
font_01_sfnt_off0000fd3f.bin
4ef514030f3656f2046c0f6c4270a3ffb1d48003e283ab230401788574f3f6f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 11312 bytes
font_02_sfnt_off000123db.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x123DB 4324 bytes