Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7cc21628b13ca2…

MALICIOUS

PDF

79.7 KB Created: 2021-03-21 05:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1466e0200ac5cbd181d5a15ddc62736c SHA-1: a594eb366cb6db280190d94c34957fff285d1e73 SHA-256: bb7cc21628b13ca2a913594d829298aed0c98d467faa9a19849c587dbd11ae2e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with a specific focus on SEO manipulation. The embedded URL `https://golowaki.ru/wix?keyword=practice+problems+sex+linked+genes+answer+key` suggests a potential phishing or scam lure, aiming to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/wix?keyword=practice+problems+sex+linked+genes+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464852/normal_601732691b075.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/Cidiinh/what_soap_do_you_use_for_soap_cutting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462059/normal_6035df6d2d7f8.pdfIn PDF document text
    • http://baltika-trans.com/how_to_get_minecraft_windows_10_edition_for_free_if_you_own_the_pc_versionpeqv7.pdfIn PDF document text
    • http://fallofelin.online/what_food_is_good_for_gerdnz3bx.pdfIn PDF document text
    • http://mmamba.ru/how_to_make_gear_teeth_in_autodesk_inventornoyok.pdfIn PDF document text
    • http://myfoxing.online/pufemexaebo.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/ibPOgja/ganipazaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_600b3ae0cf14d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_602eaa2bb3d67.pdfIn PDF document text
    • http://italylife.pro/define_outbreak_medical_termv8b0z.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/YBhhxjc/woolworths_wholemeal_bread_nutritional_information.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_9a535ce20fc64e4aa9687a8c426f6228.pdf?index=trueIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_63dee56f402b43e4bd08148b9858ba0f.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_4e3a92e089a44400b0b0e4a9ab09a2ca.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_a85739e241ca47409d42446b68231d33.pdf?index=trueIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_79a99e3f28994780b10c948e1f0bdbcf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd76747-3a1c-46eb-9baf-c7cf133da7d7/difference_between_p_type_and_n_type_semiconductor_class_12.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_d5b84d3495904cecaddba9d343cc5f2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2900078-8888-47d6-b295-afeb833178af/30762098951.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_0560ea57cbcf4b20944161ac44fbec21.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_30d073023c894baf9b0afaf81e47de08.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_ffcdb29157aa4bcebce51fa0496e9c32.pdf?index=trueIn 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_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 5860 bytes
SHA-256: 224327b127ff5f73ebf132773f1808215d80fdcc0ead6d89570a9115d3cfb8c7
font_01_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 10440 bytes
SHA-256: d1e39bcd6a7d09e6e1dc26fcdced1baceb4e7986f6b2e2094243439a0ff8ba6c

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