Malicious PDF — malware analysis report

Static analysis result for SHA-256 92871a34b0708145…

MALICIOUS

PDF

96.1 KB Created: 2021-05-06 00:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1f5fc48600e72f9ab49edafb94c4ebfe SHA-1: 3f2b709daba86367a761a69d2e14c3b142620a77 SHA-256: 92871a34b070814502ec7436aff803e1ded8f7c7b143820bb61a88823e9d9840
244 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including a critical heuristic firing for linking to known malicious redirector infrastructure. It also contains a large number of external links, suggesting a link farm designed to direct users to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=charlie+munger+portfolio+concentration In PDF document text
    • https://cdn.sqhk.co/jigekuragige/xiehh0w/stock_market_game_rules_quiz.pdfIn PDF document text
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/d04db33fcc56.pdfIn PDF document text
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/duxirazupo.pdfIn PDF document text
    • https://cdn.sqhk.co/zibavuna/ijbAhSg/rufesusixojabu.pdfIn PDF document text
    • https://xekotoruwogobib.weebly.com/uploads/1/3/1/6/131606212/puxixodop.pdfIn PDF document text
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/mapadenezip.pdfIn PDF document text
    • https://cdn.sqhk.co/pimetezefo/jgA7ihT/treasure_hunters_movies_on_netflix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_6046772c430ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_60562be77adf9.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/wZgfhc2/clock_face_generator_roman_numerals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_6032b4094d951.pdfIn PDF document text
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/zemasirik.pdfIn PDF document text
    • https://cdn.sqhk.co/riwoxedaki/XghV033/24382590583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460043/normal_600d953c785c4.pdfIn PDF document text
    • https://cdn.sqhk.co/fabavukunatu/Rha3ieg/mutant_spider_hero_miami_rope_hero_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_149b2207392a440bae758bec16ccf9be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/font_awesome_version_4._7_cheatsheet.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_d905911d9d9e4ebabacbc7a729c4af0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/magedatidefazidev.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_cfc150dcfa874e8ab800d400adbe8db5.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12210 5156 bytes
SHA-256: 78cf68acc605e96913897cd1c1dec417567455285e5b48beabc878243ba7284d
font_01_sfnt_off00013373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13373 11772 bytes
SHA-256: 43a472164f28143659df4012418fa93da873f23e8e283c7e85b8b7bb04e6ecc6
font_02_sfnt_off00015bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBC 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15