Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6826272a4ac9b78…

MALICIOUS

PDF

99.8 KB Created: 2021-04-03 05:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b2d7d0934dbc8d493efa681bbdb28d7 SHA-1: 58f868f991cc5426af9f0c9e7a7dc2a39a70e908 SHA-256: f6826272a4ac9b78d166bf820b2e3a9fe8e9625133522f4e7732447238196c55
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall heuristic profile points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://crophysi.ru/123?utm_term=lombok+earthquake+reports
    • https://static.s123-cdn-static.com/uploads/4372681/normal_6008fc48c5f58.pdf
    • http://dotenipago.medianewsonline.com/18199943091.pdf
    • https://cdn-cms.f-static.net/uploads/4450347/normal_605f8a10976be.pdf
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/tekivuzelij.pdf
    • https://cdn-cms.f-static.net/uploads/4456676/normal_6050e002061af.pdf
    • https://static.s123-cdn-static.com/uploads/4421339/normal_5ff247aa059ba.pdf
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fdf7f22160e2.pdf
    • http://wifisef.medianewsonline.com/27335983872.pdf
    • http://suvolupijiro.mygamesonline.org/10215034602.pdf
    • https://mafoxoluz.weebly.com/uploads/1/3/1/4/131483222/96729d51.pdf
    • http://nokilibetajew.mywebcommunity.org/baptism_in_the_holy_spirit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4735b9d6-038e-49e4-a285-9fd576a6f75e/69138300883.pdf
    • http://tebaputazaxuva.myartsonline.com/18680884360.pdf
    • https://uploads.strikinglycdn.com/files/4a9e5b20-4b17-4b0b-95f5-100ca701b53c/lenovo_thinkpad_t430_factory_restore.pdf
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_6f82213a70fc40a2a77cc9fd2e33c949.pdf?index=true
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_ad13b2582f014fe0b02930b2621bd470.pdf?index=true
    • http://todifisafi.atwebpages.com/computer_programming_languages_in_bengali.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110ac.bin
860a03b435dbf70d82689a24d663bc109a513a2e55d85fe44e755941fcaf94da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 5296 bytes
font_01_sfnt_off00012280.bin
0ef7cb4576c0f4b22511d1205a4b2a707bba88a74b2a2cd8437ff78192e5e343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 12892 bytes
font_02_sfnt_off000142e3.bin
acd4d9634fd8e19e6a3d7997d55bb96bdb24e7a04c25eee36fddc1d0e8731d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142E3 12684 bytes
font_03_sfnt_off00016d45.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D45 16036 bytes

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