Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1ff27416c4d970…

MALICIOUS

PDF

85.9 KB Created: 2021-02-16 18:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c7a38c0aa3635a2fb99eeb605b5039a9 SHA-1: 50419c92307b43cecb10b712e93e417377dfa51c SHA-256: 5e1ff27416c4d970ab34d5d97c7bea003e20a9d15feeae330d5a2d41b68f5852
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple heuristics indicating it is designed to link to external websites, with a specific focus on SEO redirectors and link farms. The presence of URLs like 'https://seumenha.ru/wix?keyword=kern+inmate+search' and 'https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/didigunusufurebumim.pdf' suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/wix?keyword=kern+inmate+search PDF link annotation
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/didigunusufurebumim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_602521c204cf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481170/normal_5fcee8a3898b0.pdfIn PDF document text
    • https://vanuludegevu.weebly.com/uploads/1/3/0/7/130776818/9286626.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/ic8hehi/stupid_zombies_2_mod_apk_unlimited_ammo_download.pdfIn PDF document text
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/32d8fde75c9.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/sgsdqie/xutosisupivopuse.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/psFmjij/promo_code_for_walmart_pharmacy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387219/normal_5fcf783dab2e5.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/zjcr5ib/rankers_app_nz.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/dozore/kibowow.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_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 4976 bytes
SHA-256: 31270dbe13ff41249fa6dfd1f1c460cd60fd0b3dced014dcac7cc8afc6a76865
font_01_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 11188 bytes
SHA-256: a7f83126b6e8b5c01ab8ce6d6bba04b0f84e9df65b25115127e48ede4274ead0

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