Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f74cdf24293e329…

MALICIOUS

PDF

82.7 KB Created: 2021-02-22 09:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 61da8cd0fde59f32d246a8e6c251adbf SHA-1: 4bdcbd17c98cdf3266c780d08facd0b73505682c SHA-256: 3f74cdf24293e3299d421a70f6727d8959759547621eb4e9ff064a17cf35dcb7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely a phishing page or a download for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=unblocked+games+super+mario+crossover PDF link annotation
    • http://intereriia.com/blacksmith_tools_blacksmith_tools6w7lb.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/cAgjhR3/40947089996.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/e1Pjbif/dirt_bike_racing_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/hjasjfr/archero_runes_talent.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/dxKWgit/26155239472.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hi1gehf/sobiv.pdfIn PDF document text
    • http://kirerazunesamip.22web.org/directv_wireless_video_bridge_connection_lost.pdfIn PDF document text
    • http://elerctum.org/jazz_drum_sheet_musicd2qae.pdfIn PDF document text
    • http://fito4ka.xyz/hepatitis_b_treatment_guidelines_cdco2mma.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/Igjgegh/jdm_racing_drift_mod_apk.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://fifomivosa.rf.gd/29884571722.pdfIn PDF document text
    • http://roweviwumi.epizy.com/5953076118.pdfIn PDF document text
    • http://niruduzef.epizy.com/soxixawitinotovowo.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/xerox_workcentre_7545_driver_download_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/top_5_problem_solving_tools.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_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 5452 bytes
SHA-256: f09261c34b679f879861766b137b821f9e59c3e51a55f15497b4d6fd9f0bc1c2
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 11372 bytes
SHA-256: dea3b023dff4136b12790eb3d34addac43fd271c9cc4cc02de9a20d2d5a273c3
font_02_sfnt_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.