Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dc2e195ef0ce2e…

MALICIOUS

PDF

77.5 KB Created: 2021-02-10 15:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0083182e6409f51b2c7aabb272f8daae SHA-1: afaebb1a1d874b365edefe45d8f4bcece23c6ff1 SHA-256: 85dc2e195ef0ce2e9c96ad10b4780a9348833a2195cab60c576d2c8b040e03b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF documents, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the PDF structure itself are indicative of an attempt to drive traffic to malicious or ad-heavy sites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wb?keyword=corporate%20governance%20financial%20reporting%20and%20tax%20systems
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5fc7a29b59642.pdf
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/guwoguzanujidoj.pdf
    • https://cdn.sqhk.co/gaxudofexal/ghKgjig/gopikanotisadinado.pdf
    • http://itash.space/binudakiwusajuvotefv7bab.pdf
    • http://cmbmarketing.agency/ice_boy_and_watergirl_2hf1ti.pdf
    • http://ejinaya.com/6820123565hambg.pdf
    • https://cdn-cms.f-static.net/uploads/4366661/normal_601db43ba727c.pdf
    • http://instapresent.site/5_seconds_of_summer_calm_album_release_dateydjgr.pdf
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5ff152f88665e.pdf
    • http://gufutaca5.xyz/dirt_stock_car_racing_gamesu4fs4.pdf
    • https://cdn.sqhk.co/kawiwitifa/BBliiQT/vuvupomupotewulifulukag.pdf
    • http://mihetos.xyz/rejelsoszi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lijulijowivaze/complaint_letter_template_late_delivery.pdf
    • https://s3.amazonaws.com/lovomijelun/sim_free_android_mobile_phones_uk.pdf
    • https://s3.amazonaws.com/wegemebufojafak/presentation_format_ppt.pdf
    • https://s3.amazonaws.com/rakabexozu/anxit_et_performance_scolaire.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeaa.bin
c4ad941d7a10ad5903944454b6c36c87cdce5d8e52b24c50aca50e5a71e28bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 5612 bytes
font_01_sfnt_off000101bb.bin
a8b599223f5cdcc54c6ad0081f03976186502cafbe5d8b5e660c40f76a053c5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 11748 bytes