Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c16e780176f30f…

MALICIOUS

PDF

74.5 KB Created: 2021-06-11 01:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 463b07e31766c7c9cc092f10aceb7e97 SHA-1: 03a215a9c24f17033dd6929be04d2a19ee5946b8 SHA-256: 16c16e780176f30f6e9083d15aeb3ab0d8bcf755e48393089b3543f1ad9de831
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing attempt by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to 'bodmas exercises pdf'. The presence of external URIs and the overall detection by multiple engines indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/pbw?utm_term=bodmas+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382430/normal_602003da63b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_603c2f47095f0.pdfIn PDF document text
    • https://kekidebas.weebly.com/uploads/1/3/4/6/134633427/814c22407ed2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_601e3670b6ad1.pdfIn PDF document text
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/4593644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486743/normal_5feb219f79838.pdfIn PDF document text
    • https://xoragawamu.weebly.com/uploads/1/3/4/6/134666694/tejekiduwezebemewor.pdfIn PDF document text
    • https://mokomopepu.weebly.com/uploads/1/3/5/3/135333670/5c6a2a376f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_60515d08bdf86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_60bcd5b7558ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6052e3c74ec70.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/cb91267f-e8f6-4b44-b5af-c41ed3ff8397/wuletan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f910c9d-c0b1-4b6b-be80-00635f304c9f/why_does_my_garage_door_opener_flash_yellow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306cd12d-7d00-4915-815e-95ce950f2e1b/vubelepaxefaxifemel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e76dd9d-b966-4383-a066-8d28c555fdd8/ryobi_price_list.pdfIn PDF document text
    • http://jojuzoxox.pbworks.com/w/file/fetch/144770178/user_manual_for_iphone_7_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780bbf33-3eb0-4b41-bfd1-4864e5788f80/roku_3600x_screen_mirroring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed87ad8-da1e-41bb-b65d-cb018a36142d/tc_gi_lnh_nam_chch_qui.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/zipovagibutemoromugab.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144667230/29665931003.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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 5384 bytes
SHA-256: 62bf4aa553ecf551c8e273b3d8dacd406ffcb780f78d0488a159ea767746c422
font_01_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 11236 bytes
SHA-256: 440e4e7f04b0bf9b486a096b1ce6def8866bd267fcbd687f989a45ddbac679df

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