Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f7a3a5f085ecf0…

MALICIOUS

PDF

78.2 KB Created: 2021-02-26 00:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f16b67ed8f8f9f16de30f02391cbd34d SHA-1: bd85b2135256148ad3f996740213c992fff82195 SHA-256: b9f7a3a5f085ecf031f79b53642cd81a58233ab61d1cfe3e5aeefff44c0a4497
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=duraflame+electric+infrared+quartz+lantern+heater PDF link annotation
    • http://skameyki.club/jimopajujepodepu1y8zk.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/ahgiigh/pinball_arcade_ps4_tables_on_disc.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/iU1zhch/princess_salon_2.pdfIn PDF document text
    • http://ewwe.space/gelifobotukemiloy14io.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/csihkhf/art_wallpaper_hd_pinterest.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/vkhhvck/jugevuwexolu.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/aLR9hhu/family_guy_quest_for_stuff_events_list.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/79NjIjc/live_cricket_match_streaming_app_free.pdfIn PDF document text
    • http://musofiron.ru/gigowafimekeygyvx.pdfIn PDF document text
    • http://covidcapsule.world/sql_server_2012_sp1_evaluation8scgy.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/pwWjbGG/62223049446.pdfIn PDF document text
    • http://latozon.iblogger.org/cefalexina_bula.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/aHxgc7n/picowords_level_2.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/jgdhisO/xavaguridifisig.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/1gjIWha/hill_racing_games_apk_download_uptodown.pdfIn PDF document text
    • http://tcerkovniekupola.space/79516065927ty7yk.pdfIn PDF document text
    • http://idealica-official-it.website/mopotikemajidudamoajwro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoketuru.epizy.com/xunedubipakepemijeveb.pdfIn PDF document text
    • http://xizajitidug.rf.gd/lovawojunifiwenezo.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_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 5260 bytes
SHA-256: fe17045071e8cf99d4fe954e3be3c8d5a9aab48f1c76d8e1ffb9e2142c6538cc
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10580 bytes
SHA-256: ae2cea6512b783652b8862b570f2a74b37531d088e624cb191e6cd168c173c6d

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