Malicious PDF — malware analysis report

Static analysis result for SHA-256 a079603bde66f971…

MALICIOUS

PDF

70.4 KB Created: 2020-11-24 06:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d6aa6a549f8477223cf3277866ecb872 SHA-1: ebcc5d58722f112c051cb88a8cae6161cb323abc SHA-256: a079603bde66f9719256a86418ae005a8ea9a517d4f6e08d07778e2f47085139
236 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous external links, many of which are part of an SEO link farm, and one specific URL is identified as a redirector for a 'free-download phishing' lure. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly indicates the document's intent is to trick the user into installing a fake browser extension or update. While no scripts were explicitly extracted, the presence of external links and the nature of the lure suggest a phishing or malware distribution attempt, aligning with ClamAV's detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffi.ru/aws?utm_term=allavsoft+spotify+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489042/normal_5fb565c0a5543.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/gosiwadoluso_niwikuxaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_5fb8904b777f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5fb4b75132087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5f9aedb1acff6.pdfIn PDF document text
    • https://rakulemuvi.weebly.com/uploads/1/3/4/5/134506415/safojadokogepivir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_5f961d56d55c1.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/5377125.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/a12d0911-09cf-42f0-9fe1-2ff4c2cc8fcf/beginner_level_reading_comprehension_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1061f22b-c2e6-4af4-a808-b281554adc39/98800468149.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/pec_minor_stretch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a51d9ec-872c-4e0f-9d6a-9f220dd5eb1d/body_heat_1981_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28120c07-3d0f-4588-a399-f21c41e41415/listen_to_john_fogerty_songs.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_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 5184 bytes
SHA-256: b87d45c434b9ab2a22b68fb3b255e8b5b6304f18a798c2593454e89e3b2ce27e
font_01_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 11160 bytes
SHA-256: 7bcc478db11af5a3e1c092e02555ede6d6a408aa964bd22c904418eb8a79a960

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