Malicious PDF — malware analysis report

Static analysis result for SHA-256 61328c89015fdbe7…

MALICIOUS

PDF

71.3 KB Created: 2021-03-16 04:11:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e60806231fdd426d912ce870e7eb43cc SHA-1: 4934916db9edf938f1fd6951fe35c52abed8ada4 SHA-256: 61328c89015fdbe75be147d378f98cbb7918b99be503ce41a29c8e37e3c0771d
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external URIs, including one pointing to 'druttle.ru', which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded links suggest it is designed to redirect users to malicious websites under the guise of providing academic resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://druttle.ru/award?keyword=calculus+early+transcendentals+8th+edition+solutions+manual+pdf+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413226/normal_5fe004b21a20f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fe778ea42306.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/gheEic2/end_it_movement_merch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5fed0d8d2eeed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5fc751a4f1769.pdfIn PDF document text
    • https://wabatopopelak.weebly.com/uploads/1/3/0/7/130775953/8871928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_604a8cb067888.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/hcib2ib/58413575598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_600c3975e240e.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/PggBhd5/8995105915.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/ihhtn7U/18724174104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490375/normal_6009356f679c1.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/59ccb16da1b3.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/ZjbherI/74457471024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3b6d1d-b5b4-4548-a60b-82bcc7b5cee0/how_to_see_review_pictures_on_dhgate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e992fa-5229-412e-90ee-bfc7e647fa67/hoover_dual_power_max_pet_carpet_cleaner_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271fb930-fc2c-4e3c-9a23-c4da0d9c5b1a/rival_crock_pot_bbq_pit_instruction_manual.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_d8a218e383604bdc8e2e9ae42483157c.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_bac57a5255f143e791b59737c8a31350.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb21bc15-f998-4dc1-ab89-aab6e1ee58b0/minister_license_laws_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fdaba95-7cfc-420f-856f-86181c441de3/40015675158.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_10077d05d0524afc9c37c400f91f887b.pdf?index=trueIn 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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 5596 bytes
SHA-256: c969c7f453951cb72fd2eaadb38d24b862cd665d14e7b5b5ec0dfeb1f81aa503
font_01_sfnt_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 9872 bytes
SHA-256: 033aea29e89f0b52cc83d8fbfbcb6a72b1d290f6b7594d9199af5778e980ee56