Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9853a7d6f28a75…

MALICIOUS

PDF

85.6 KB Created: 2021-03-31 10:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 832b159864670cf1556d4e9c8a987801 SHA-1: 4f3eec011b3f363c71f33b03d43866b51ecc5b29 SHA-256: 4d9853a7d6f28a7502d85e9b678d97b9bb2fc0cfa460b3402d8dcd404151b696
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to potentially harmful websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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/wix?keyword=biotechnology+restriction+enzyme+analysis+of+dna+answer+key
    • http://nawitebexu.medianewsonline.com/game_of_thrones_season_8_script.pdf
    • http://bosemefawixuwov.mypressonline.com/risekenifawabolinifajibi.pdf
    • http://rabusasomel.22web.org/73507766858.pdf
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5fed7a8b73135.pdf
    • http://fiwisud.getenjoyment.net/beginner_gym_workout_plan.pdf
    • https://cdn-cms.f-static.net/uploads/4483083/normal_604018e0511a6.pdf
    • http://suvasemujodi.22web.org/warhammer_40_000_8th_edition_rulebook.pdf
    • http://zonipig.iblogger.org/albuquerque_street_map.pdf
    • https://cdn-cms.f-static.net/uploads/4369518/normal_605ffd36f2c4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c1e1c1a-c937-49ed-b966-19eaf01ec3c8/xaxura.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_ba579d1cc3a84639b69336bf9a672b8d.pdf?index=true
    • https://s3.amazonaws.com/tozaduliwubega/61757792700.pdf
    • http://libejejizu.epizy.com/83272491842.pdf
    • http://dafiwogi.rf.gd/49182119530.pdf
    • https://s3.amazonaws.com/lepefi/60603050104.pdf
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_9d1f438050db485f8b7d246cad06c8ed.pdf?index=true
    • https://s3.amazonaws.com/mefonevimimix/how_to_become_a_child_social_worker_australia.pdf
    • https://uploads.strikinglycdn.com/files/080984da-f05e-48db-8967-7a225e5c5cee/fusono.pdf
    • http://femagela.myartsonline.com/utilitarianism_notes.pdf
    • https://uploads.strikinglycdn.com/files/dbf4c223-55af-47af-a40d-da7162e94d72/zisaronotefitalev.pdf
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_3d6059e10a0d4592afb247f5512241a5.pdf?index=true
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_93939b3ea4024641b1f271fa6c16ee35.pdf?index=true
    • http://dasobiviwadodaj.atwebpages.com/zidevesotono.pdf
    • https://uploads.strikinglycdn.com/files/945b3b07-ea6c-4ba8-9412-233b1035941c/what_does_trop_mean_in_greek.pdf
    • https://s3.amazonaws.com/resisuna/nimoworazuwovigitowir.pdf
    • https://s3.amazonaws.com/jijari/53277347962.pdf
    • https://8bbfbdb8-1895-4472-a1c6-9e834ce25a60.filesusr.com/ugd/7deb27_5fec0b648d5546bfbf875da376b81621.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a55aa1d3-2f04-4740-b7d0-7749af6ee8fe/75316621251.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010903.bin
ca93bfed35430cbf29515c0228a2f8debe3d7f982be84840bf6b5b08c8b733d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 5792 bytes
font_01_sfnt_off00011cba.bin
a06223de64822e4bfd6c2058ff74b840e9df1233d95b79c2ec49735abec634eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 12192 bytes

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