Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7dc1a39ce5b440…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 18:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eacdd74008dde3ce54141c19d61264af SHA-1: bd16e3414e675f87b134ad9a2b3b8159492be137 SHA-256: 5e7dc1a39ce5b4408863ca0e2107c7e485f922ed3a0d6a0b169f9aafb83d7a37
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://leonvi.ru/wix?keyword=the+sorcerer+heir+pdf+free
    • http://fepekasizu.iblogger.org/renajokas.pdf
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/xawerasofome.pdf
    • https://mutuwafidiz.weebly.com/uploads/1/3/6/0/136095616/dowubifami_mudakanafawovol.pdf
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/sowokasi.pdf
    • http://mosebuzixat.mywebcommunity.org/tikikusotixamifavagas.pdf
    • http://lajodibibodi.getenjoyment.net/readings_in_ancient_greek_philosophy.pdf
    • http://dusamoka.mywebcommunity.org/what_is_the_gospel_of_wealth_about.pdf
    • http://ninomut.sportsontheweb.net/definicion_de_registro_anecdotico.pdf
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/1358915.pdf
    • https://labomozojaxige.weebly.com/uploads/1/3/0/7/130738499/dubugugokaluga-xudilix.pdf
    • http://zonerokemub.getenjoyment.net/2826245624.pdf
    • http://pasiworuwiwoz.getenjoyment.net/81750896067.pdf
    • http://linodogeb.scienceontheweb.net/66119136861.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xogijowag.onlinewebshop.net/devirazozojabuzanob.pdf
    • http://toxuvuzi.epizy.com/bangla_to_english_word_book.pdf
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_26e9486d8b4349c19e5c9c4dabd8994f.pdf?index=true
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_b9e0d68f5c2749bb8478721e135e3952.pdf?index=true
    • http://pasemox.rf.gd/zukonavoxusaginozal.pdf
    • http://kojuvurapamox.myartsonline.com/ribuzajuninezesopopiz.pdf
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_7bb09c8c182c4012a16df7707cea57e7.pdf?index=true
    • http://pobuwejugu.epizy.com/casio_a159wgea-_1ef_gold_digital_watch_manual.pdf
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_da9561e46d9f4beab5a760fcf33cfb22.pdf?index=true
    • http://vokesakogo.onlinewebshop.net/83963386277.pdf
    • http://nurivab.rf.gd/irritrol_rd-600-r_setup.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_off0000f74a.bin
6eb08566b558b7173770f89a1f9c093f2e1b8fdadb44bf95cac8cbd24e402c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 4948 bytes
font_01_sfnt_off0001081f.bin
3cf98200d295b7f78a83dc23da24a8f42325de2fcd7b3eaf8bb9f503e4b7b69e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 10568 bytes

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