Malicious PDF — malware analysis report

Static analysis result for SHA-256 046330ceabafa69a…

MALICIOUS

PDF

73.2 KB Created: 2021-06-12 14:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1be0b3ca2c197775373edd4e3b01ee6c SHA-1: 40c91d782435cb5bf62d9da6e2475d712eff0061 SHA-256: 046330ceabafa69aea08c362348eb2279815d76a45d09df3835107fefd225d24
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, and is detected as a phishing/trojan by ClamAV and an ML classifier. The document body, though corrupted, suggests a lure related to 'previous year iit question paper pdf', indicating a phishing or credential harvesting attempt. The presence of embedded URLs and the link farm structure strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/pbw?utm_term=previous+year+iit+question+paper+pdf PDF link annotation
    • https://sokarapojuler.weebly.com/uploads/1/3/1/1/131163736/dezadil_tuwabunezo_gokomirolusi_sosub.pdfIn PDF document text
    • https://bozalugim.weebly.com/uploads/1/3/4/3/134343660/mufusomavitivikebupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_60c2109d79f3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5ff1d1f24a6c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_6048632a5c235.pdfIn PDF document text
    • https://velotukuzikud.weebly.com/uploads/1/3/4/7/134722024/2215594.pdfIn PDF document text
    • https://vamexerop.weebly.com/uploads/1/3/6/0/136085595/bb0b5119e4.pdfIn PDF document text
    • https://wavixupenug.weebly.com/uploads/1/3/4/3/134386336/2b6c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_60b9c6b089d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_603bfad8b5850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejuzor.pbworks.com/f/60832952187.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144503178/tusika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec805846-1cef-4804-aeee-e1f33e00b24e/gear_circle_bluetooth_headphones_manual.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/145170030/kevasebumukovipikuxupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad6cc92-87b6-497c-bb15-d40168475254/academic_writing_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd6939c-a7dc-4f0e-b1e5-49bb2a529e44/natilafozarilerepat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36e8239-dd8b-4ed1-b24a-aaa697167c3a/lekizekidarabepurupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edaa67f-1f34-4759-a05b-31ca4adeeaf1/how_do_you_reset_a_whirlpool_ice_maker.pdfIn PDF document text
    • http://kuduwoxux.pbworks.com/f/narrative_research_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91bf89d-f620-4295-a5d8-4a1eb2ea4e0f/goxirigifijav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef1762a-03a0-42ac-93a5-0322453056dc/feminism_is_for_everybody_passionate_politics.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144421854/xaxabeluwa.pdfIn PDF document text
    • http://gogogivu.pbworks.com/f/need_for_speed_underground_3_full_pc_game_download.pdfIn PDF document text
    • http://nodisakajew.pbworks.com/f/dotodokaviporibugamir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7133d78-b543-46cd-8bf0-3e44d37d0c94/popatirusuvabel.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 5292 bytes
SHA-256: ca3ce371f660f4827f098cb30390fe903f18c998ac32c8470e8de5f0470f986c
font_01_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 10516 bytes
SHA-256: e5d1b7857fb81b4d19f532942549c473e47fcebd1250795de3e9be2b19647cc3

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