Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd503db57bc0f8a…

MALICIOUS

PDF

73.3 KB Created: 2021-04-18 02:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29b874c5cd7d97b00c090f703c2a6ce2 SHA-1: b0322b12cdd8c8a409d14fe5ea43d610a01fdd71 SHA-256: fdd503db57bc0f8a91aad7dd4e07aa97474f4982356985f9ad2228649eae0310
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic to drive traffic to potentially malicious sites. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=crystal+report+tutorial+in+asp.net+c%2523+pdf, which is likely used to redirect users to a phishing or malware distribution page.

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://jottigo.ru/strik?utm_term=crystal+report+tutorial+in+asp.net+c%2523+pdf
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/xuwidopejonev_fedefigoke_dadumunepozu_pemosidufurem.pdf
    • http://melidagerukebel.sportsontheweb.net/algarve_guida_turistica.pdf
    • https://cdn-cms.f-static.net/uploads/4368745/normal_603c040fdae37.pdf
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/3553310.pdf
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/fagovozuriber.pdf
    • https://cdn-cms.f-static.net/uploads/4415081/normal_606e1f9640a71.pdf
    • https://cdn-cms.f-static.net/uploads/4454043/normal_60563cfc90def.pdf
    • https://cdn-cms.f-static.net/uploads/4402244/normal_603f22a8d1abc.pdf
    • http://rapiwanijisage.scienceontheweb.net/best_annotator_mac.pdf
    • http://pawomodom.medianewsonline.com/what_bait_to_use_for_catching_crappie.pdf
    • http://dunodipike.sportsontheweb.net/ancient_egypt_society.pdf
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/7f3dbef2.pdf
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5fc6d54fefd25.pdf
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/9582035.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_66af8ccf6cc24821ac496877f2ae99eb.pdf?index=true
    • https://s3.amazonaws.com/podawakumepewez/36722094243.pdf
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_0a794b586eaa45449e4b86463291d704.pdf?index=true
    • https://s3.amazonaws.com/pezofut/how_do_you_politely_avoid_answering_a_personal_question.pdf
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_621bab3c8d414a9a8746f5edbc8f0d7b.pdf?index=true
    • https://s3.amazonaws.com/pevarijidasalop/24824068856.pdf
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_2f2e604bd25e4acdbe587ba8f6364e19.pdf?index=true
    • https://s3.amazonaws.com/paxuvagal/sodastream_fizzi_one_touch_costco.pdf
    • http://leparitupoxow.onlinewebshop.net/alrededor_de_las_maquinas_herramientas.pdf
    • https://s3.amazonaws.com/zifozujiwi/fallout_shelter_can_never_find_mysterious_stranger.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_off0000dd37.bin
7d9f041b709483f32e0632290ad79429b82172cb1ecfe297d23268a2e6ab1705		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 4964 bytes
font_01_sfnt_off0000ee36.bin
18bf35024389e76a5f0ef2cfdb7d6ff817a8bdf6f4a987ac4d4c913cea45bb09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 11680 bytes

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