Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc167311ebb9e51c…

MALICIOUS

PDF

74.1 KB Created: 2021-03-16 06:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 069e38c356b2b7df56c81ae087f02d06 SHA-1: 0e500c46c62c5c99d18d2e20382e566c5573c418 SHA-256: dc167311ebb9e51c991c1c4c0729837c80f4f3574d07b536c6460e576cb5bcff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious or SEO-manipulative content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to external URLs, which is a common tactic for phishing or malware distribution.

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://nipisod.ru/wix?keyword=science+pacing+guide PDF link annotation
    • http://avlto.best/50728799153uzqh9.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/lufimemokokozur.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/aQzifE6/28576624702.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/bP8jigd/download_game_indonesia_drag_bike_racing_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ghgwYge/border_patrol_agent_arrested_in_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/jAZkhCe/59800955834.pdfIn PDF document text
    • http://p-kavkaza.ru/what_does_jesus_say_about_the_food_we_eatblkcf.pdfIn PDF document text
    • http://bettermoneytips.com/what_are_the_four_types_of_marriage6mcoq.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/jgfXPvV/bridge_constructor_apk_full_version_free_download.pdfIn PDF document text
    • http://evakuator-uga.ru/192894009544dkt1.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/egh8MDl/ximomev.pdfIn PDF document text
    • http://damvglaz1.xyz/is_tilapia_fish_farming_profitablefzfq6.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/4588347.pdfIn PDF document text
    • http://doorstepcomputers.com/35533680759kdg23.pdfIn PDF document text
    • http://goodsfor.life/harga_young_living_lavender_15mlqcbie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0fca49-46f3-4540-9350-06fdfd217ff8/soda_stream_reviews_2019_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33691882-53e7-4b4b-a496-e8c6c7c7d6c8/how_to_improve_sentence_structure_and_grammar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7aea2d-5d6e-4924-8ffc-c38cac654b4b/what_is_the_power_of_one_horse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d636fa50-02f4-417e-998a-437e2c6b57dd/jitterbug_flip_phone_best_buy.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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 5036 bytes
SHA-256: ccb4b0c701a00dd8915e5c5efb76ccc9fda1dde151beb9eb4e7c8ae47342685c
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 10868 bytes
SHA-256: b0fcc03ac40d724f2f1a138f26657eab6c6bb666c9c9eaa00d399cca84dbf9a0

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