Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34bd65faa251625…

MALICIOUS

PDF

80.9 KB Created: 2021-03-09 17:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af60669d10341287f39749675abadbf SHA-1: 6399eb863a1a8872c634c0fdf3abd0fc3f81621f SHA-256: b34bd65faa251625de14561603b79dcf41be00ba77cc2aaeb2cd4d4a31f0a239
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one prominent URL pointing to 'dafemum.ru', suggesting a phishing or spamming campaign. The presence of embedded links and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/123?utm_term=nsc+post+office+full+form
    • https://cdn.sqhk.co/sixitigoxeto/h8ien7A/96495572419.pdf
    • https://cdn.sqhk.co/gavezexu/9xihjcT/77198095659.pdf
    • http://pesuloduf.medianewsonline.com/51060238604.pdf
    • http://kukushka.space/mechanical_engineering_masters_georgia_techa3ojp.pdf
    • http://gejejasofubi.mywebcommunity.org/35850635645.pdf
    • http://bcipreactivaperu.com/bugsy_malone_full_movie_freeruqoj.pdf
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/pajeb.pdf
    • https://cdn-cms.f-static.net/uploads/4393893/normal_600d92980defa.pdf
    • http://gaydating.world/78300388746q6dwh.pdf
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/7801291.pdf
    • https://cdn-cms.f-static.net/uploads/4387918/normal_602440161f495.pdf
    • https://cdn.sqhk.co/wubukuxivupe/jnIhahi/17778773146.pdf
    • http://zunuruxeguxifi.mygamesonline.org/angeles_y_demonios_free.pdf
    • http://zobotalemogi.sportsontheweb.net/vowug.pdf
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/josigubajova_tipenafez_xetibe.pdf
    • http://damita.fun/instant_pot_vegetarian_cookbook_amazonp152y.pdf
    • http://miribut.mywebcommunity.org/62286316039.pdf
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5fe3071830514.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_8c38ee7438ef4a24be3e933f94f87a96.pdf?index=true
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_f2138d355fe341898768960374b2a5f4.pdf?index=true
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_3d5d925d6eb74e57b442d0e86734ad2a.pdf?index=true
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_7fac668bbfe14b6885938d1060e19436.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_fbcf8bda040d4367a17b6810ff965e9e.pdf?index=true
    • 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_off0000f373.bin
6f2c98a43356dc7a0e5e855dc56c179caac36aeed0092f05caeed86bf7dfb435
pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 4696 bytes
font_01_sfnt_off00010371.bin
f4f53223869339abcfd6d9447ec011a046c9713aabdf5006e529ba0f5da40e79
pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 10736 bytes
font_02_sfnt_off00012836.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 4324 bytes