Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1daec5c3c7dae8…

MALICIOUS

PDF

80.3 KB Created: 2021-04-28 02:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cd830fa9aa05227e1f6134441a869147 SHA-1: fd9c3053dc19b7646c281b5560530fe79cb45377 SHA-256: 3f1daec5c3c7dae8a25a7802c71f841c978c3f31c207b87e45e3c566e33713b0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both a machine learning classifier and ClamAV, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, containing numerous external links, with one prominent URL being https://botokaw.ru/strik?utm_term=denon+avr+1912+7.1. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure suggests a lure to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=denon+avr+1912+7.1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485714/normal_6011eeee1acd9.pdfIn PDF document text
    • https://janikopet.weebly.com/uploads/1/3/4/6/134690806/8f4d9bc2253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_600a190de3708.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/sibineliniz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405654/normal_5fe4962fd4403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_60497186312b0.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/809be297-9cb4-4949-811d-42c59f6085cc/what_does_a_scientific_apparatus_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9e0c2d-25fe-4ba3-8f0d-2539a5a8c4c5/xolojotole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1056fb-e818-411e-aca8-006a3631f5b3/41660078075.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/avast_antivirus_free_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5240dd0c-b9f3-4733-aaa5-84c0d0c047d6/matad.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/hp_elitedesk_800_g1_twr_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14989ec-d52d-46a6-8100-39fca9c1cb9d/taxedusiwalopegime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c4b8b3-f0ae-4001-b460-0a54cc4192bb/milafukod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51687b0d-7206-490e-8993-21cde19cdd3e/norwegian_escape_deck_plans.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_5ce5a54ce0994be39b4a8c9773d1e5a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/066a8719-11f7-4328-8b29-0f6328d488eb/how_long_does_it_take_to_smoke_a_large_brisket.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_5bfcfb4959fe4f6eaf491d54bfeefcac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifukedot/minecraft_unban_hack_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1070f13-728b-4efe-ae97-3cf1f2f2027d/noxusubekutenasozovi.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/20846893189.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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 4640 bytes
SHA-256: c63b8481fdc099da5a2b9502d52e043a401ebaa85c898bdeef916de3df794410
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 23840 bytes
SHA-256: d9535a81d473b799ea2afa933f799ce7cdcc5dc4b9c4686610442a1ce136e783
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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