Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b25cbf8c511acbc…

MALICIOUS

PDF

93.1 KB Created: 2021-03-28 12:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecea6736b81b62e33e6264876f7337a1 SHA-1: 3611d298d5483c2085bfeedb2bd27098bbcd073d SHA-256: 2b25cbf8c511acbc60005dc7fe240f5f2e598ac2bf1ed9f32518ebf22371ab7f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a domain associated with SEO manipulation and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://maypoin.ru/wix?keyword=assassin+cross+leveling+guide+ragnarok+classic
    • http://qupieasy.online/87375121157k3vuu.pdf
    • https://cdn.sqhk.co/kisereta/5w2jgia/biceps_clicker.pdf
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fc9d4dda7ded.pdf
    • https://static.s123-cdn-static.com/uploads/4416151/normal_5ff5dc322ac68.pdf
    • http://5-euro.info/kenmore_158_sewing_machine_bobbin_casemdgmd.pdf
    • http://vufepeb.22web.org/what_are_examples_of_retrieval_cues.pdf
    • https://cdn-cms.f-static.net/uploads/4367624/normal_6013f0d0a448c.pdf
    • http://gopubewigofopa.iblogger.org/femepabar.pdf
    • https://cdn.sqhk.co/kubepugemaki/giAifjj/street_fighter_iv_characters_list.pdf
    • http://ig-mediateam.net/786846662453i5xa.pdf
    • http://kvyovk.xyz/candle_light_song_lyricsa8nak.pdf
    • https://cdn.sqhk.co/jumibizede/jecIOhg/zikonopi.pdf
    • http://biomaniix.website/95494031451ifjxm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/85aa1776-b582-4a4b-8aef-2a717ab073f8/full_movie_the_pact_2014.pdf
    • https://uploads.strikinglycdn.com/files/58520c75-bc8f-4b48-a0b1-401aba26da7e/48160616183.pdf
    • https://s3.amazonaws.com/bibejovixapis/how_to_unlock_network_on_samsung_s8.pdf
    • https://uploads.strikinglycdn.com/files/50fddc41-9e20-4ea3-b70c-aadf72e37256/5822646590.pdf
    • http://pagupim.epizy.com/network_security_group_azure_terraform.pdf
    • http://fuwotimusajitos.rf.gd/raral.pdf
    • https://s3.amazonaws.com/dusined/xutufemavotulowojimogisiz.pdf
    • http://zowonotetejubi.rf.gd/98369974456.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_off00011c5e.bin
5b384a4c418777900bb634dd89303eeeb2f27264fc30e8c6e74cb7c42a44c213
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 3492 bytes
font_01_sfnt_off000128e0.bin
3c2b6eaebdf6f238f823a6720fac588bb124608fc74a1de02c6ba8173f725224
pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 5220 bytes
font_02_sfnt_off00013ab6.bin
4a16de2515843ae55b53619c3f1e25078e654b1f90c1493582d2148d677b8f08
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB6 13544 bytes