Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b9ca367c401f00…

MALICIOUS

PDF

84.1 KB Created: 2021-03-06 03:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 42e3a8eb538d30e67bf84c71816ca1d0 SHA-1: d0ac0a00b5381e43eb0772f59fd0a183281e0de0 SHA-256: f1b9ca367c401f00a7a3e7ee44e77912dd25e86d6115bc268bc460fdf2d73b12
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, appears to be a lure related to car maintenance, which is a common tactic for phishing or malware delivery.

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://ponafet.ru/strik?utm_term=how+to+clear+maintenance+light+on+2003+honda+accord PDF link annotation
    • http://mantenancie.com/online_photo_frame_printing_chennaihkeia.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/fupanimejexamopeboja.pdfIn PDF document text
    • http://raisinshq.club/space_exploration_merit_badge_worksheet3z7ij.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/fisher_paykel_refrigerator_parts.pdfIn PDF document text
    • http://xavukagidasali.iblogger.org/babexibukujiniwazuv.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/22837948316.pdfIn PDF document text
    • http://albatros-trans.ru/delphi_radio_clock_setl2q2s.pdfIn PDF document text
    • http://setomomenoku.22web.org/mogaxixifovusos.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/1._mention_the_current_trends_in_operations_management.pdfIn PDF document text
    • http://help-igcopyright.xyz/289114647355kt6q.pdfIn PDF document text
    • http://morasufas.iblogger.org/collectible_doll_value_guide.pdfIn PDF document text
    • http://dkmz3.club/springer_handbook_of_roboticssddal.pdfIn PDF document text
    • http://electorat.org/how_to_find_freelance_work_uk6ychm.pdfIn PDF document text
    • http://foyou.store/jamie_eason_day_3zaqm9.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://kupikobu.epizy.com/dowabenulime.pdfIn PDF document text
    • http://kiwerenanasi.epizy.com/82881201610.pdfIn PDF document text
    • http://bukofitezude.rf.gd/sebutofoxigetizudipafomox.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/hey_soul_sister_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/59774109615.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_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 5456 bytes
SHA-256: a3f2ff2515366839db7628c41d9627af87f31844a87f1e7fecd9e87d7621816f
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 10948 bytes
SHA-256: 16f510ff76cea6bfb24281171a5d5aab0213f98bd80500c9a75221b9b1bf1363
font_02_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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