Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7b2eebe50d7936…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 13:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3334ea597e4281a360d4b2c5f4d8970f SHA-1: b556edb44076afaf9c2c41ece35ad1d374b25ede SHA-256: 1d7b2eebe50d7936d6de71f98bcffc95d3f01687b9f80fe835c1bb8bf3132c90
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, dugedepap.ru, is presented as a search result for 'dirt race cars for sale in michigan', indicating a lure to drive traffic to malicious or spam sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/wix?keyword=dirt+race+cars+for+sale+in+michigan PDF link annotation
    • http://steelsho1.club/taxasawenolasogit3stvc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_6031484ecf5f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5fcac69087633.pdfIn PDF document text
    • http://uose.xyz/rodixagomuxajiporijejimrf1sx.pdfIn PDF document text
    • http://alteramaks.world/amazing_color_fill_3d_how_many_levelsci7uu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5fc5d2a9156d8.pdfIn PDF document text
    • http://adminhalil.com/drop_baby_drop_ukulele_chordtgffl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484818/normal_6003981ab563b.pdfIn PDF document text
    • http://wgathering.org/tevesufijajomabakujwo3pb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/91e6e6fd-e28b-4b1a-ac85-b50bf8b5803f/monkey_business_saying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07778196-abf2-4fac-9064-8a080c39a3cb/fepibolekobewakugabik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4d6635-c6bc-4689-b321-78d04a86bd95/tijafaporig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/872eb51c-27f7-4774-bdd7-2041f2ffca41/desirezerawidod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1b2acf-d5b4-49e1-804e-1749efe3f836/cuisinart_toa-60_air_fryer_toaster_oven_black_friday.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_e53ce00d1c4a4f45a3d6ba1e83cfb377.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_f5e471590ef8405cb84f475d8b01075b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3dd5a9-83b1-4afa-a9a9-987129069d21/drivers_ed_chapter_10_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a6470d-d03a-4dc1-902b-8b70a8170279/24431207889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cc5c80-ae74-40b9-b828-bd8a3d9e1137/16175984070.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 5080 bytes
SHA-256: 475a39c18cc8bcdf0db7405c6e90ee31a2faa1066c75f3577baec2366a278b19
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 11228 bytes
SHA-256: 5a5b8e9d3a76f869c4f0d97122038bb3e0d68238e9e5f017f8482f839cbfd1d2
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378