Malicious PDF — malware analysis report

Static analysis result for SHA-256 918972518e4aac47…

MALICIOUS

PDF

79.3 KB Created: 2021-04-27 00:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 763eb1b78ca7e51bcabb9898f5b45a5e SHA-1: 20ff4f8477a04c74586659e5af1ef2870661571b SHA-256: 918972518e4aac47d159990360b73c59a141ebc947f86896811b68d4a26660a5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://maypoin.ru/strik?utm_term=how+to+fix+dell+computer+not+turning+on', suggests a lure to trick users into visiting a malicious site under the guise of technical support. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://maypoin.ru/strik?utm_term=how+to+fix+dell+computer+not+turning+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489057/normal_601b3ab6e8396.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/96847755949.pdfIn PDF document text
    • http://copyright-help-report.com/how_to_say_yo_yo_in_spanishqzdw5.pdfIn PDF document text
    • http://reabook.online/where_is_pi_on_ti_30x_iis9dtm1.pdfIn PDF document text
    • http://presalle.xyz/nemelegojepz7ycs.pdfIn PDF document text
    • http://hhizmet.com/pajuzuwewaxegamavejinoro2l.pdfIn PDF document text
    • http://it50save.info/memimobesorkfzy.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/jcfOslF/5823455233.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/qheie2p/heyy_make_new_snapchat_friends.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/core_strengthening_exercises_for_beginners.pdfIn PDF document text
    • http://yourbigdick.space/pojumojetopasudiwitawndqmj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459468/normal_5ff096368201b.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/ljaBF14/noraxoxikenetofakozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_6020be6967593.pdfIn PDF document text
    • http://bigmagazin.xyz/drugged_high_on_alcohol_documentary_worksheet_quizletf9ld2.pdfIn PDF document text
    • http://topfrag.rip/dopudobiluwukeyl3lc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_60394585ed347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445736/normal_600b752719437.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/8bgdgjV/64345365217.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/gowojekitinirakabix.pdfIn PDF document text
    • http://sakaxek.mygamesonline.org/challenging_behaviors_autism.pdfIn PDF document text
    • http://goodnatural.space/81247606576vcqct.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5ff4c575a0e37.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/hehdGTg/movies_by_flixster_with_rotten_tomatoes.pdfIn PDF document text
    • http://zzzmmmmejjj.space/c_m_g_full_forma88az.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_602c1145e69f9.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 5208 bytes
SHA-256: fc95e14946656d51d3a8fd50d785d482483c277dd1b777deb27da6169881b093
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 11452 bytes
SHA-256: 625c3bbea91780e91c16d6308786742295fb8e8403d58f237484a728f1befb24