Malicious PDF — malware analysis report

Static analysis result for SHA-256 3110961834fa6dd5…

MALICIOUS

PDF

70.9 KB Created: 2021-03-13 18:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 09ca61e99847cffdbf08902bc5a78488 SHA-1: 21645b7483955023f9c861751223877b85559d2c SHA-256: 3110961834fa6dd573f07a002fcb70cbfa79dbab3b458e99e6c6db4b7492f7b3
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=ffx+remaster+guide+book PDF link annotation
    • http://dajexori.mypressonline.com/irregular_reflexive_verbs_spanish_preterite.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/fe2d55f4fc.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/fhiggJ6/tufedixekilu.pdfIn PDF document text
    • https://cdn.sqhk.co/bafuberudod/jdJhdee/knowledge_is_power_decades_playstation_store.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/bhejeYH/biozone_ib_biology_second_edition_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/Aii4tRw/geritijowupadizepif.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/biblia_ortodoxa_anania.pdfIn PDF document text
    • http://boost-store.net/lara_croft_relic_run_mod_unlimited_money1cirq.pdfIn PDF document text
    • https://cdn.sqhk.co/jabezoxujo/chd0ii4/gtr_r34_wallpaper_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/ZhjGihT/kurasasupafa.pdfIn PDF document text
    • http://zdorovienashevse.xyz/20993410912p7rxc.pdfIn PDF document text
    • http://copyrightnotice-ig.com/tabla_de_multiplicar_hasta_el_20bnqor.pdfIn PDF document text
    • https://cdn.sqhk.co/dupabeket/ieTiiSP/zepowinupabemuwajotubal.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/64242544477h7i84.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/mcts_guide_to_microsoft_windows_7.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/456075468825hyiq.pdfIn PDF document text
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/xemaboposigeki.pdfIn PDF document text
    • https://watuxiso.weebly.com/uploads/1/3/2/7/132740831/1735747.pdfIn PDF document text
    • http://chambrehub.xyz/minn_kota_i-pilot_replacement_remote_controlezh9q.pdfIn PDF document text
    • https://janonezofeto.weebly.com/uploads/1/3/4/6/134664798/muwesurim.pdfIn PDF document text
    • https://febufovita.weebly.com/uploads/1/3/4/3/134324671/sekabef-wesitij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 5200 bytes
SHA-256: 3b3c421374cd0bec25ce1f7f507994ffbf5d8f4ae7f3f6f05c4493fca505cb0e
font_01_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 10392 bytes
SHA-256: 1341f4c60bcae0ab6b095ce9a46949d5610e3665ccb3549a8e81e7430a59e9b6
font_02_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34