Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e741e0087c1d9c…

MALICIOUS

PDF

79.2 KB Created: 2021-04-09 19:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d54516f237ddcdda62f8cc50b5540a5b SHA-1: 8f16e65140c1e5440468b6093f617b01af96e9ef SHA-256: a1e741e0087c1d9c1826725c9fcf9b070c3ea780b3c33010b70a1f5785ccff82
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=an+introduction+to+mechanics+daniel+kleppner+pdf PDF link annotation
    • https://cdn.sqhk.co/talexadu/GDPtbia/bojuwavepu.pdfIn PDF document text
    • http://somenem.iblogger.org/biochemistry_questions_and_answers_for_medical_students.pdfIn PDF document text
    • https://mugojilakifev.weebly.com/uploads/1/3/4/5/134510671/4921812.pdfIn PDF document text
    • https://cdn.sqhk.co/zibojaje/ijOuYgf/the_podcast_app_vs_apple_podcast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_5fd80ac702718.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/8Gjgjby/non_rev_loads_app.pdfIn PDF document text
    • https://jelebemurufipo.weebly.com/uploads/1/3/4/4/134442628/kemukutaguj.pdfIn PDF document text
    • https://zuwiwenulabir.weebly.com/uploads/1/3/1/3/131381762/pokijebegudiw.pdfIn PDF document text
    • https://cdn.sqhk.co/zosikoto/8ij47Oi/work_experience_evaluation_report_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_60615571e18dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_600b21fca43a5.pdfIn PDF document text
    • https://cdn.sqhk.co/fekolisuzub/cXhdhdx/80949751104.pdfIn PDF document text
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/nezuwarovad_banigawos_mavazowasobosi_mufured.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/risisipajole/what_is_a_good_diet_for_kidney_health.pdfIn PDF document text
    • http://ramenejepom.rf.gd/certificate_pem_crt_format.pdfIn PDF document text
    • http://gezexibubaju.rf.gd/kivodoseriresumazu.pdfIn PDF document text
    • http://xibabenamogen.epizy.com/turnaround_time_in_laboratory.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/99043926324.pdfIn PDF document text
    • http://vakewexapenox.epizy.com/scramble_for_africa_simulation_ppt.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_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 5448 bytes
SHA-256: 009bd8fd4d92e830b638200abe62ee7fc250a4c79fc0165b3f01510ff8f2617f
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 11704 bytes
SHA-256: 65f6ac21e4f53bc9832698a2b9240a695ee358b0c7eeef0f1b4d73dda7db4fba

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