Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1efc246f24d030…

MALICIOUS

PDF

75.7 KB Created: 2021-02-02 12:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 301e508df9742486198c9ddb45c1c1eb SHA-1: 25e7d6a3637f061e17848110b134d2721643d1b0 SHA-256: 4b1efc246f24d0305ee9eb7bdf32a5d900fdff8530150ed2a6bd216ba15fb7f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of external URIs and the link farm heuristic strongly suggest this document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/123?utm_term=unitary+elasticity+demand PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408983/normal_5ff25c0f8c6f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_60103a5ce783b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_600828dab2e5a.pdfIn PDF document text
    • http://haifaiv.ru/color_balls_falling37eg0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_6016ed8b79992.pdfIn PDF document text
    • http://all-system7.work/terraria_better_character_creation_modkjo8g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5ff12478b5878.pdfIn PDF document text
    • https://cdn.sqhk.co/suxumeva/hdTigty/3375227788.pdfIn PDF document text
    • http://boost-store.net/dadodaxuxpm36p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fd10f1db0c98.pdfIn PDF document text
    • http://rerubin.space/american_football_games_for_nintendo_switchetrs1.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/cjfjfie/97435319509.pdfIn PDF document text
    • http://citrus-fruit.space/silvercloud_gps_tracker_reviewsmif63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fc82e9557ee1.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/tqjjjiy/95521546972.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/nazowonemebasaboj56irw.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/g4igjjT/sushi_ninja_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/NUghgjM/chef_ludo_lefebvre_net_worth.pdfIn PDF document text
    • http://kawlites.online/62753712003vps36.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/iyU0Pjc/dxracer_1000_series_gaming_desk.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/msi_n1996_motherboard_manualvpwab.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/iTV3Ny8/panda_run_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/8giQji8/dining_table_sets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 5180 bytes
SHA-256: 97c2ea433332bd3f8d1b5e5310c364c7da46791de3e5388e8396318fcac42600
font_01_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 11280 bytes
SHA-256: 949f9af5d153ac79920d874bce8413420acbcbc15490356472dae51a9cb19e70

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