Malicious PDF — malware analysis report

Static analysis result for SHA-256 3064021700261155…

MALICIOUS

PDF

64.3 KB Created: 2020-12-13 14:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d5ead6fa02b5fa35a90c428f203499 SHA-1: 1dbc51a99e41a37ffff027b3271eba5cf4da0c83 SHA-256: 30640217002611555b1b6ca7ce7030e3305406161362ce339aeb5a5238a93072
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to educational content, which is a common lure for phishing attacks. The presence of embedded URLs further supports the malicious intent.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=addition+problem+solving+worksheets+for+grade+2
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5f88a3a7f0f48.pdf
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/faef649d002e626.pdf
    • https://cdn-cms.f-static.net/uploads/4453327/normal_5fbc0ebcb28f5.pdf
    • https://zoseruvabu.weebly.com/uploads/1/3/4/4/134492528/2149328.pdf
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5fac02ac35122.pdf
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5f8b19a8aff3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/707584f4-5cd1-420e-b423-614d022e4aac/college_football_scores_today_scoreboard.pdf
    • https://uploads.strikinglycdn.com/files/97af7acc-4120-4bdf-a0b8-611ee3151443/36708202565.pdf
    • https://uploads.strikinglycdn.com/files/c769f3ee-f517-472a-b2ab-c0d8f564bb49/badibakatokajutixesuvamew.pdf
    • https://s3.amazonaws.com/ligole/sideload.cc_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/2df97305-4311-402c-916c-6cdc89baaaa9/pokorib.pdf
    • https://uploads.strikinglycdn.com/files/bbe1f0a4-217b-4da9-befc-a35dd4b45e66/hamilton_beach_waffle_maker.pdf
    • https://uploads.strikinglycdn.com/files/3ee48287-450e-4491-ad4c-c3d48a17e299/zatubavimav.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b09a.bin
3618627be1e797f9e41769ab5a931c0dfa918e87b93c685c7e6fc22c49f30702		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB09A 5720 bytes
font_01_sfnt_off0000c3e9.bin
6bb1429821b2dd1bb61b4f0b997617a27fb86a9194f29ea009f025175590f9dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E9 9984 bytes
font_02_sfnt_off0000e60b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 4324 bytes

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