Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77c2003e16fc901…

MALICIOUS

PDF

80.4 KB Created: 2021-03-22 23:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 088b86811dd1d885f10405e031a4ddff SHA-1: e6319a70b2f3f69c1fa533eb85380c2dd1fcaf97 SHA-256: c77c2003e16fc901c7a0318295ce3ddd86f81c9f322feb7894365b52291352dc
186 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and contains what appears to be metadata rather than user-readable content, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/123?utm_term=emoji+meaning+snapchat+android PDF link annotation
    • https://puxonuge.weebly.com/uploads/1/3/1/3/131383548/7183247.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/2017_toyota_camry_custom_seat_covers.pdfIn PDF document text
    • https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/9747041.pdfIn PDF document text
    • http://igafnd.org/cochlear_nucleus_kanso_sound_processor_price67mal.pdfIn PDF document text
    • https://sidafixeruj.weebly.com/uploads/1/3/2/6/132681612/banolonomevewoluxil.pdfIn PDF document text
    • http://xikapajami.mypressonline.com/complications_of_type_2_diabetes_mellitus.pdfIn PDF document text
    • http://kindraretterath.com/finding_ultra_quoteslhs85.pdfIn PDF document text
    • https://tasozowi.weebly.com/uploads/1/3/4/3/134315408/ca5a622.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/how_to_use_shop_vac_as_wet_vac.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/3793943.pdfIn PDF document text
    • http://supermagazforsale1.xyz/17748661944kqcul.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/wegoxujonobijagogag.pdfIn PDF document text
    • https://zexojoru.weebly.com/uploads/1/3/1/4/131409474/rururorole_vukafetik_jopagolojuxa.pdfIn PDF document text
    • https://kojaxinepizoju.weebly.com/uploads/1/3/1/8/131856409/moteporoligavezimad.pdfIn PDF document text
    • http://jumbochecker.com/937246023742nud1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/ibpsguide_monthly_current_affairs_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0106a61a-7913-4de5-9a4b-e87272843bec/27595903156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7906ebb-ac84-46b3-9a77-e1b03b716fd6/hp_windows_10_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9df1f13-fbb6-4982-8fe3-9520ba45d7a7/idioms_worksheets_2nd_grade_free.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/86361018683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1acde4a-b5b4-464a-9d88-7af27371c7eb/fuvewotutaton.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/billi_billi_akh_khan_bhaini_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129d1269-f5db-406b-b8bd-98276650e679/prepositional_phrase_worksheets_with_answers.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_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 5488 bytes
SHA-256: 3fb45cf4961984a1fd411a3d01bfb853c10361f400e2cc38e08b7e176b025204
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 2400 bytes
SHA-256: 044f6f676565d484db291949a81515e4c155e5e1cde6c3f3df02c5c1856541e8
font_02_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 10696 bytes
SHA-256: 461cefd59e195f4a022663db870e22fed573f5193338a5425e24cf3ce6495865