Malicious PDF — malware analysis report

Static analysis result for SHA-256 da13a3219a8a1e63…

MALICIOUS

PDF

80.7 KB Created: 2021-05-15 18:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23bcefdd405fca9c891801a23486f622 SHA-1: b0cad3160707c000ad618b9636d9e88c19e1ea46 SHA-256: da13a3219a8a1e63da29c9e63ccb77138e4b6fc855e1853c8d51471eb2130d1e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a primary malicious URL identified as https://bologen.ru/strik?utm_term=how+to+make+beef+jerky+in+oster+dehydrator. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest a phishing or redirection attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+to+make+beef+jerky+in+oster+dehydrator PDF link annotation
    • http://kigirifaduguv.getenjoyment.net/6874272196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415929/normal_5fe0bc0e360d2.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/2ZELigu/merekixidisuxujifaler.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/Xidhghh/easy_payday_loans_for_bad_credit_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/g1ibSic/gisipusovijiworujavebimab.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/HQggfia/97876523255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_6053ae9a0f4f7.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/1b278278-380f-44fd-9a04-155d229846f7/why_is_my_whirlpool_dishwasher_not_getting_water.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/bifepajojexoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ace8644-cecf-401d-879a-df6037c4af49/wagner_power_painter_plus_6.6_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/epic_of_sundiata_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8c1635-3ce8-48e0-a102-de3ed09b3c36/whats_wrong_with_american_beauty.pdfIn PDF document text
    • http://roxudafemif.epizy.com/91539408242.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/calories_in_a_bob_evans_sausage_link.pdfIn PDF document text
    • http://gakupoxefale.epizy.com/charismatic_leadership_in_organizations_conger.pdfIn PDF document text
    • http://fukuselumetu.myartsonline.com/can_you_cook_a_turkey_crown_in_a_slow_cooker_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f521ff5-2989-4361-8fec-03b8246fa02a/lab_report_biology_matriculation_basic_techniques_in_microscopy.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/45271266519.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/full_form_of_ktm_in_police.pdfIn PDF document text
    • http://topufopotu.epizy.com/motu_patlu_ki_jodi_free.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_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 5552 bytes
SHA-256: fdcfce84b019b74245cf95585a6969502815d09997f945cdd281952cce0d454b
font_01_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 11172 bytes
SHA-256: 0c9ba1e671b8782230ab3b034a063a5cb4ae37141d0612ddcfddc9ab1c7fdf3d

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