Malicious PDF — malware analysis report

Static analysis result for SHA-256 51744bf958cd547e…

MALICIOUS

PDF

71.2 KB Created: 2021-03-03 11:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6cef5964b6972a8ff3a9408c9dfa8175 SHA-1: 4ef152ecc488f7718c2d8dca662bdfa570e3fb0d SHA-256: 51744bf958cd547eb2739c5011e194906f50209f713dd44215e4b8c64b96716e
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm, suggesting a phishing or malware distribution scheme. The primary lure appears to be a 'Doss bluetooth speaker manual', which redirects to a URL that likely serves a malicious payload. 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://gimoguvi.ru/123?utm_term=doss+bluetooth+speaker+manual PDF link annotation
    • http://myyshooop224.site/bionicle_pc_game_2001czofi.pdfIn PDF document text
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/merefafodi_fudun_dofado.pdfIn PDF document text
    • http://mamontov-net.cc/bell_tent_sewn_in_groundsheet7oi9h.pdfIn PDF document text
    • http://5gusevshop.space/good_boys_google_docs8k00t.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jhie7no/marshalls_home_goods.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatikob.epizy.com/89440785162.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/bigo_china_apk.pdfIn PDF document text
    • http://tumejez.rf.gd/4888778170.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/89760247411.pdfIn PDF document text
    • http://rodukamofuf.epizy.com/acaai_2019_poster_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/46767792423.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/avery_templates_labels_5195.pdfIn PDF document text
    • http://pojovalomoj.epizy.com/89775579201.pdfIn PDF document text
    • http://gurepabe.epizy.com/disputing_things_on_your_credit_report.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 5260 bytes
SHA-256: e61dc3fe71e12f0f56171b80e37ffc2bd9a70576c2b18360166dac14f376eefc
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 10212 bytes
SHA-256: 030af61315bf6590aed321cc2ae754c65766175f329a3be475ecdf529b242fb3

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