Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a834311c2580d75…

MALICIOUS

PDF

77.9 KB Created: 2021-04-18 17:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 579c2268d937f9c56750305c090eca9b SHA-1: 61e8ebecdfadd1526b3f15d5d54a62fe17cb6a6e SHA-256: 0a834311c2580d7523007be3ca663b6dba245c29011722e307cb7e7082808b54
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious websites. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a common attack pattern for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=how+to+hook+up+rca+adapter
    • https://cdn.sqhk.co/febutatesu/iajeihU/social_intelligence_meaning_and_examples.pdf
    • https://cdn.sqhk.co/bigulikexupa/jzmMjdg/fajulaberepuv.pdf
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/c53d65d2965.pdf
    • https://deparabijafepoj.weebly.com/uploads/1/3/4/0/134040416/jomizomorutorini.pdf
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/bosolefazuwo.pdf
    • https://cdn.sqhk.co/seponidozit/msbjg9k/535873843.pdf
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdf
    • https://vopumatibu.weebly.com/uploads/1/3/4/4/134402560/6344562.pdf
    • https://cdn.sqhk.co/kovixileta/hghibJD/10469418165.pdf
    • https://dajemegexiri.weebly.com/uploads/1/3/4/4/134492390/tiwegemiwasakuna.pdf
    • https://cdn.sqhk.co/tagodepa/mjdgifQ/merchant_marine_salary_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gorajikunobixi/indian_customs_declaration_form_2019.pdf
    • https://s3.amazonaws.com/tupofelasujewas/wosezowavefodaxukoreja.pdf
    • http://jevejizodirosaw.epizy.com/xiponaneguti.pdf
    • http://vokifanebol.rf.gd/siwaroparuwimaxififopona.pdf
    • https://s3.amazonaws.com/tuxutedi/44049100814.pdf
    • http://napusikut.epizy.com/alter_ego_a2_guide.pdf
    • http://kakoxoduruze.epizy.com/peduwasuv.pdf
    • https://s3.amazonaws.com/suximawo/overhead_expenses_template.pdf
    • https://s3.amazonaws.com/wekibik/72395920870.pdf
    • https://s3.amazonaws.com/wizidimawag/81153509845.pdf
    • https://s3.amazonaws.com/varoximu/xivupife.pdf
    • https://s3.amazonaws.com/mesotodimus/repimefivubunenero.pdf
    • http://rubofad.rf.gd/third_trimester_checklist.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97b.bin
10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 2900 bytes
font_01_sfnt_off0000f3be.bin
5c49d1b1000f63e239c3606367ea0205405df6413e2fec8780060406581f40df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 5068 bytes
font_02_sfnt_off00010502.bin
587a4acaea69acbaff377b467957916cbd5d1192ddf28fe9642ccb6b6abc583b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 10764 bytes

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