Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d380c01708a1f02…

MALICIOUS

PDF

88.5 KB Created: 2021-03-25 16:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 252e464c37118842007f666e8d9ad992 SHA-1: dcf42f2318afcd8351ae13f4215a99b402beffee SHA-256: 6d380c01708a1f026ce5659cbd2b7c2f6cf630c27b338363551e51a317ca3db7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and by ML classifiers as malicious. The presence of external URIs and the ClamAV detection strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/123?utm_term=nccn+guidelines+for+gallbladder+cancer
    • http://nopadejitakuf.22web.org/ntse_answer_key_2019_stage_1_rajasthan.pdf
    • http://copyrightshelpcenter.com/crude_the_incredible_journey_of_oil_answerss0hzk.pdf
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5fdb51f3e872c.pdf
    • https://static.s123-cdn-static.com/uploads/4489730/normal_5fe39540073b1.pdf
    • https://cdn-cms.f-static.net/uploads/4376869/normal_604d1018d77ba.pdf
    • http://zoxogadi.22web.org/sugijivatuwoje.pdf
    • https://cdn-cms.f-static.net/uploads/4498883/normal_60478e6fb5206.pdf
    • http://mnclassis.org/usar_cabify_en_madrido5yba.pdf
    • http://naturapple.space/880893735899vpl0.pdf
    • http://sikepelisu.22web.org/78452402708.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7057eace-a90b-4d7e-9b89-e6cd77a96c14/sound_logic_xt_user_manual.pdf
    • http://rogokumopukizu.epizy.com/89896874908.pdf
    • http://fuzunusizaxewo.rf.gd/sword_art_online_characters_kirito_and_asuna.pdf
    • https://uploads.strikinglycdn.com/files/c006ceef-a7cc-400e-b7c1-574f29ac4968/pejibe.pdf
    • https://uploads.strikinglycdn.com/files/c847644e-ac61-4e2f-85a5-c15512021483/sumomizuwa.pdf
    • http://wevevaviz.epizy.com/blu_ray_print_tamil_movies.pdf
    • http://fipizojuj.rf.gd/bpc_sap_installation_guide.pdf
    • https://s3.amazonaws.com/jesidofefe/58512158703.pdf
    • https://s3.amazonaws.com/nufidibodudulad/coordinator_identity_v_guide.pdf
    • https://uploads.strikinglycdn.com/files/53cd144e-3af4-496f-aecf-23c80651b784/what_genre_is_warriors_into_the_wild.pdf
    • http://gepuxaxevo.rf.gd/78665701580.pdf
    • http://medozazi.epizy.com/meputipotalawawomit.pdf
    • http://difirapafod.epizy.com/british_law_dictionary.pdf
    • https://s3.amazonaws.com/pogolo/sodab.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_off00011c69.bin
43474e847e95effe80b410613f5e8670b683595913e9c5c0e8ae3e3e24f97c24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 5296 bytes
font_01_sfnt_off00012e82.bin
a6c4dcc8207af4f64c0c03082b23f3c5c510598e1a25dd11eb17a52549f1b63f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 11136 bytes

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