Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28a533730e78a74…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 21:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 960c4c7e80e97de261407988d4e964f9 SHA-1: 815b7f60da5b8f92dc3d46ab19152d94a28b8f41 SHA-256: b28a533730e78a74e81e135f40fb97518e2e26af6680fcc29c5f9b8e2f556820
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to a malicious website, masquerading as an answer key for a vocabulary workshop. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

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://jumiwimov.ru/wix?keyword=unit+6+vocabulary+workshop+level+a+answers
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/tewezezivozire-kifosumabejoso-winuwezisif.pdf
    • https://buvikibera.weebly.com/uploads/1/3/1/4/131453013/88b9e6acfa6a.pdf
    • http://zeruzatuton.22web.org/jasisivoloralom.pdf
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/0436d835906.pdf
    • http://gididowofugu.iblogger.org/kitchenaid_exactslice_food_processor.pdf
    • https://sajabewegapin.weebly.com/uploads/1/3/4/5/134592402/4905400.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_0745c5f192b04c799c9fd2bdfc0950d2.pdf?index=true
    • http://xotopunutogor.rf.gd/which_is_the_best_spy_pen_camera_in_india.pdf
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_fdd40d9c06de4b198dcb67963b48c813.pdf?index=true
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_def20283722543f8ae97a86bac0d35f6.pdf?index=true
    • https://s3.amazonaws.com/dutimajizowa/26517267083.pdf
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_28447970a5134d8190ac30cb04dbcf0a.pdf?index=true
    • http://toririli.rf.gd/the_endless_river_forever_and_ever.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_2f25408a2f7740a9af537ffe8e09c96a.pdf?index=true
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_0bfeb25bed5f43f3a9c7aaa98910a675.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_91d0fcdc23e34f118e88a8528a9bb17f.pdf?index=true
    • http://romezegipoxo.epizy.com/61733430051.pdf
    • http://nizoduni.rf.gd/62969039730.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/best_ringtones_for_android_phones_free.pdf
    • https://s3.amazonaws.com/vexeliku/curriculum_vitae_free_templates_word.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_off0000eb93.bin
02b6fe7e6f78f8c2c1471e40b046d16873561b20be61de0f677ad1ce7c2ca4a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 5508 bytes
font_01_sfnt_off0000fe57.bin
9b681e1cadb9d141320c11f73ee592798167ccee3b5f4e858a3213c1cc9378c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 11352 bytes
font_02_sfnt_off000124c1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 4324 bytes

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