Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab9d1704f9e8ed2…

MALICIOUS

PDF

78.0 KB Created: 2021-04-07 13:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e2dfa1b4904eb285b81c8e43d34f64e9 SHA-1: 0250d1d28780f7ed87f4de56073dac25f1de8ef1 SHA-256: 4ab9d1704f9e8ed2fb8c17cee214413d3bc1c9dfda591c2049df8add17fe9e16
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to host other PDFs. The primary URL points to a keyword-based redirect, suggesting a search engine optimization poisoning or phishing lure. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://jacksth.ru/wix?keyword=ap+biology+phylogenetic+trees+pogil+answer+key PDF link annotation
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/dodiriwosalebegigi.pdfIn PDF document text
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/xumawibovapad.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/muwowitovakomejotew.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/ifCVhii/ski_jumpsuit_womens_uk.pdfIn PDF document text
    • http://rifivejawix.22web.org/chandigarh_police_song_djjohal.pdfIn PDF document text
    • http://kaforij.22web.org/40670972036.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/gfidlmM/53403819955.pdfIn PDF document text
    • https://morexenuf.weebly.com/uploads/1/3/5/3/135311883/8416338.pdfIn PDF document text
    • https://gegosaso.weebly.com/uploads/1/3/4/0/134040985/90713b165.pdfIn PDF document text
    • http://fofafowazu.66ghz.com/solitaire_for_windows_10_free.pdfIn PDF document text
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/1875072.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/bieBgh6/navy_field_game_mobile.pdfIn PDF document text
    • https://pitulero.weebly.com/uploads/1/3/2/6/132683003/jonusirevi_bebofetex.pdfIn PDF document text
    • https://cdn.sqhk.co/negenowiji/gz8asi1/faxemiwixajijodogafukom.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/nWPl8wJ/bejuzenufisuxetixa.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/hfgjgcX/wadewis.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/d5gfoPb/granny_smith_apple_recipes_paleo.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/Cidjeia/sustainable_development_goals_2030_wikipedia.pdfIn PDF document text
    • https://gutamigev.weebly.com/uploads/1/3/1/1/131163772/6fcf557a0af430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitizukot.rf.gd/cutting_edge_intermediate_3rd_edition_teacher_s_book.pdfIn PDF document text
    • http://fupisemari.epizy.com/difference_between_socialism_and_capitalism.pdfIn PDF document text
    • http://zoxutudirufusoj.epizy.com/sfinae_function_template.pdfIn PDF document text
    • http://sawopigemon.epizy.com/amazfit_watch_face.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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5584 bytes
SHA-256: 9ab9a8a4bddf4ed4a530d37680ee5752006d2485801c1d88a240f91f538e963c
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 11728 bytes
SHA-256: ed0b638bcec3703943022cf60648360a10d07e9a24c440a8b91c2b9edb4a9077

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