Malicious PDF — malware analysis report

Static analysis result for SHA-256 744e9454c0aa7656…

MALICIOUS

PDF

92.5 KB Created: 2020-12-28 21:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0a758700e49354a0c3ab5dc445fad8ae SHA-1: 9a4d63cd8c7dfacae5c9cf9af5319fb76c35e327 SHA-256: 744e9454c0aa76562a83f15ea82312851ca0217d715c6d6dee3ae4ae0ff04245
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and an ML classifier. It contains a large number of embedded links, with several pointing to known malicious redirectors and disposable hosting services, suggesting a phishing or link-farming scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://traffine.ru/aws?utm_term=laravel+blade+form+hidden In PDF document text
    • https://nojezedefefowas.weebly.com/uploads/1/3/4/7/134762002/xozop_rodufetefaziw_tavibozimi_vopovazed.pdfIn PDF document text
    • https://baforaze.weebly.com/uploads/1/3/4/7/134756429/goxegekemituwo_xebarod.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/vinurivodekeduvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_5f9e1ab332485.pdfIn PDF document text
    • https://palujiro.weebly.com/uploads/1/3/4/4/134491920/1601893.pdfIn PDF document text
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/19900e.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/2226cfd5-2d74-47e7-861b-e829a1ca438e/empires_and_puzzles_training_camp_levels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0371aabf-5fa4-4fd1-b852-dd1e136b4007/englewood_chicago_food_desert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb085af-b8af-4f50-9a5e-a4c07151fc4a/fusarisavamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ec7a90-fdba-4a5e-845c-bb574bcbe425/78849477085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b26020-83d0-42f2-acd9-0574c5bc29b2/tulovebev.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/vofubazupelejileta.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/88110677506.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_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 5108 bytes
SHA-256: 8c5554c6d6c2c3eb8f79a28bf9bffe9cf1114489358b88d31ffdb702948ce181
font_01_sfnt_off00013b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B90 11724 bytes
SHA-256: 4e1dcf091ab66e36644f3f4d6ce275adb008a6499bb0e9f64ffef61394091bde

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