Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e813657a2b1555…

MALICIOUS

PDF

76.0 KB Created: 2021-02-11 18:31:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45ec9068262f0ce257c3b5896fd79ee8 SHA-1: ed8818a34beba1142099ccba218b3e2dfa2466e4 SHA-256: 43e813657a2b155569df10f84e8999c44252b0cda8c31bff1e8d8439e4804cab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns align with common techniques for luring users to malicious sites.

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://druttle.ru/wix?keyword=shadows+of+evil+solo+easter+egg+walkthrough PDF link annotation
    • https://cdn.sqhk.co/zosiwikiw/FheDItE/18844038131.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/V0VhiQ3/1944822139.pdfIn PDF document text
    • http://jixelaxoli.66ghz.com/vizikodukeminerixegutab.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/8117763.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/h8Hjdid/mlb_shop_store_nyc.pdfIn PDF document text
    • http://zinabexodepo.iblogger.org/next_steps_forward_in_guided_reading_resources.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirevotijo.epizy.com/piwusoxizolutagosexunil.pdfIn PDF document text
    • http://felepav.epizy.com/beregeponugejutivako.pdfIn PDF document text
    • http://pizibajavodup.epizy.com/nelokejodamume.pdfIn PDF document text
    • http://mitegoma.rf.gd/27144643790.pdfIn PDF document text
    • http://zegokufa.epizy.com/depularotupitekobepexewun.pdfIn PDF document text
    • http://mudasaki.epizy.com/nejoziwerasavup.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/95224442057.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_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 5488 bytes
SHA-256: b296d859fbe0cda2f4a8c5fa8c79f1d7079755e33a36647d6e61406711df0a80
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 9780 bytes
SHA-256: 891cd88ff0adf18594c21d7f897193ab958e91cfa316ad09e4c3e9e28ccb513d

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