Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1ed3b46ea1d1ae…

MALICIOUS

PDF

78.7 KB Created: 2021-03-31 07:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd56cfd7682244bcfe5cabaef89dce56 SHA-1: 82cb841daf8e9b7f2c8eaec9221672c5c5acf558 SHA-256: 3d1ed3b46ea1d1aeb8635f51bfc2651d079884565ac4514eee6aae2d5b4f7e69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/aws?utm_term=mame+0.139+roms+set
    • https://cdn.sqhk.co/niwuruba/ig5hcXN/ltlt_pasteurization.pdf
    • http://juwupexutaval.mywebcommunity.org/nomazasifezorekipad.pdf
    • https://cdn.sqhk.co/fabozesemi/fif5HTL/ffx_monster_arena_drops_list.pdf
    • https://cdn.sqhk.co/ruvazilu/enQk29M/78858553473.pdf
    • https://cdn.sqhk.co/sitosuduf/TAzLjd2/gym_circuit_training_exercises.pdf
    • https://cdn.sqhk.co/jotapepikota/U7Oif2g/komidu.pdf
    • https://cdn.sqhk.co/wujozuzewed/qih7jeC/rail_nation_bonus_code_free.pdf
    • http://kopumiwabetare.66ghz.com/cellophane_fka_twigs.pdf
    • https://cdn.sqhk.co/noviraxat/R9vauja/are_there_any_kpop_stores_in_florida.pdf
    • http://fakurivevid.scienceontheweb.net/usmle_rx_first_aid_step_1_express_video_2013.pdf
    • https://cdn.sqhk.co/xewimoziwuvo/hiigjds/vuwutawidubegotulefawu.pdf
    • https://cdn.sqhk.co/motuwezelu/eggXCM8/20545768942.pdf
    • https://cdn.sqhk.co/joxesinejag/s0bjfhc/69431298165.pdf
    • https://cdn.sqhk.co/menekilebuz/xigjfie/wukexavijagixo.pdf
    • https://cdn.sqhk.co/mikevoponage/qighbk7/bavafigudovivetuselan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fewilux.rf.gd/wunijata.pdf
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_8b750e1d569b45a693066aef7f4dff22.pdf?index=true
    • http://lojubefogugiku.onlinewebshop.net/podokepokunanub.pdf
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_41634e4ba8634ce5911dc859f984c973.pdf?index=true
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_7231df8b38fe4c01b45be4d0db914e14.pdf?index=true
    • http://sikejilewiz.epizy.com/29751895054.pdf
    • http://sojetabusat.rf.gd/chain_reaction_movie_free.pdf
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_8b6b5bb95eca4e40b15d86b33797a883.pdf?index=true
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_7c11ee6296ab455c96bee63906811aaa.pdf?index=true
    • 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_off0000f657.bin
e8fa31dea66b1c33ee630af1141513daf3c129254816a1b2b950db39cce2a8db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 5348 bytes
font_01_sfnt_off0001087e.bin
5cd27669d4f41f254217b65c3c765431d7d102887988720c2d1df1f7810747cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 10880 bytes

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