Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b4ed0121439dea…

MALICIOUS

PDF

69.3 KB Created: 2021-01-08 12:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 81438c248fa72655e2e0d09263116277 SHA-1: c16841591c03c7bc2a474e17707223edfd46df88 SHA-256: 55b4ed0121439deaeb741a9ab6a4774f28e219069882fc76a18f8551820fb43f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://trafficel.ru/123?utm_term=phim+chien+tranh', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafficel.ru/123?utm_term=phim+chien+tranh PDF link annotation
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/408adc104fd52.pdfIn PDF document text
    • https://nobaditidiz.weebly.com/uploads/1/3/4/2/134235496/8635843.pdfIn PDF document text
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/rerejimixelema.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/nenaton.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/bd2065a7-b8d3-406d-9ea0-77c76ab878cd/ohio_river_valley_map_1700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2cdcd6a-1b7f-464f-bcfb-47e4e6bcd11c/63539010634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ea1a53-d0c6-4408-b8b3-9ab2e7df64db/canon_in_d_violin_duet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2824d67f-0a6a-4f6c-9e24-de5d0a7f280c/fitosaxupogudezumur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48c994b-5d48-4ffd-93ff-6624ddc27825/captain_tsubasa_ps2_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/152467cb-73d5-4b46-962e-e1587df800db/cellular_respiration_and_photosynthesis_relationship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7ea801-dd85-4aea-979e-dc2388b81b88/fegeluturinowibisewivil.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_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 4828 bytes
SHA-256: 1c3ee3214072f174561d434ec011aa629b889c704dece2e807c8f9d4d53b41f5
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 10884 bytes
SHA-256: cd94d63559d30da2ada5481b0691395de81f3def3cf50b51b238bbac93ad244a

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