Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa282a6371b36aa…

MALICIOUS

PDF

85.1 KB Created: 2021-03-11 22:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d0e9cd41111ad7a1a2819e94d40838f SHA-1: 1650a37cdbc5ed666698aa6bd5be98bf96eafd53 SHA-256: 0fa282a6371b36aabf98cf14e9305f79930d4d4bfd8e1a2daf65fa161906fcc4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one prominent link points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body text is heavily obfuscated and appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=dirty+grandpa+parent+guide
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5fe97b1c8cc54.pdf
    • https://kelesidudukakub.weebly.com/uploads/1/3/5/3/135340861/8916503.pdf
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5fcca1d9c4039.pdf
    • https://static.s123-cdn-static.com/uploads/4379482/normal_5ffd0a3b8c78e.pdf
    • https://cdn-cms.f-static.net/uploads/4367665/normal_601d0522687d0.pdf
    • https://wimazuwog.weebly.com/uploads/1/3/0/7/130740080/906560.pdf
    • https://cdn-cms.f-static.net/uploads/4455881/normal_603812832ac06.pdf
    • https://static.s123-cdn-static.com/uploads/4456687/normal_6007aae34dbcd.pdf
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fdda308d192c.pdf
    • https://cdn-cms.f-static.net/uploads/4451217/normal_604785b7c1905.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/af9f2737-4a06-4e42-8360-439947cd2be7/genie_blue_max_garage_door_opener_sensor.pdf
    • https://s3.amazonaws.com/kefiperizonofu/6th_grade_go_math_book_answers.pdf
    • https://s3.amazonaws.com/sorogamat/concave_mirror_image_formation_experiment.pdf
    • https://uploads.strikinglycdn.com/files/773e5b26-1f60-47b6-b41e-5aa237c9f801/32286338629.pdf
    • https://s3.amazonaws.com/potamotaz/ab_initio_ib_guide.pdf
    • https://s3.amazonaws.com/muvevanepen/kenmore_elite_he3_washer_manual.pdf
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_6cd7e57f86604654af81dbf60e2ea838.pdf?index=true
    • https://s3.amazonaws.com/widiku/33357242671.pdf
    • https://uploads.strikinglycdn.com/files/d55740fb-4102-4c1b-9890-71aa3e344074/fisher_and_paykel_dishdrawer_fault_codes.pdf
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_1759abb258114ed98f28d7c5e33fe77f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eb9.bin
a59091d630a1dd28562fcd9c05978e05b19a0764921b485fa14fb04f454c58cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 5020 bytes
font_01_sfnt_off00011feb.bin
03d08098775461dcec22a114279c9c975806b3f546e21df7d6290d2156c00bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 11656 bytes

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