Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f617c83d1e416c3…

MALICIOUS

PDF

72.9 KB Created: 2021-02-07 20:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 020d7f5252d5a4a048d972d92c8089b2 SHA-1: 49fbc047b9feb1aa36701cfce19d99db328b5c5b SHA-256: 2f617c83d1e416c32851613008386881f5a8ce4a7faba8cac5090256e2af1eb4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wb?keyword=honeywell%20chronotherm%20t8095%20manual PDF link annotation
    • http://kartaidatodemeleri.com/missile_command_atari_5200_romvwb7k.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/1952665.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/bgdjfha/48556968253.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/bcIAxig/sosugokirupisif.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/dJ1Cbgg/f1_2018_playstation_store.pdfIn PDF document text
    • http://olymptrade.buzz/css3_tutorial_for_beginnersb01mk.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/8jjjgjl/school_edition_think_think_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/xegapanasa/jfcge5W/final_fantasy_xv_pocket_edition_android_review.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/5Lxjfgg/jufevevej.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/8281364.pdfIn PDF document text
    • http://sellforce.ru/current_weather_report_at_chattarpur_delhij6j6y.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/Zuidiji/sepugaladajun.pdfIn PDF document text
    • https://nodejobirutita.weebly.com/uploads/1/3/4/7/134748641/f163c22b4.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/hxhigch/junuvamadalusurunerejoma.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/2078804.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/ghii6gi/18622493178.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/wupagivoz/xepuresutira.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/brocade_300_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/odia_song_2018_dj_appu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 5632 bytes
SHA-256: 83b8ef1c8539f3f32af846dac30dba8229fdf95871a678c11b9add97ed16678d
font_01_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 10476 bytes
SHA-256: d1a984f4f347cb13afc31fd201d9e7f6fb6d07baac6ee1bffa5da4e5785a41a0

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