Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec93aaafcfb54b2…

MALICIOUS

PDF

80.2 KB Created: 2021-03-19 09:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d09401c2b74ab43ad92baeacb65417d SHA-1: b5b8489198f1acf0005857d587b98eff041a0daa SHA-256: 3ec93aaafcfb54b20a1a8b1a19a1afe0a4eba8dcb579e4d60e61a59600f4d72b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=poweramp+full+version+unlocker+apk+download+revdl PDF link annotation
    • http://dutusejutax.22web.org/math_addition_subtraction_worksheets_grade_2.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/korutewasezenafixid.pdfIn PDF document text
    • http://gvidilon.ru/conjunctions_exercises_for_class_8_with_answersaoizp.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/rizovobobetaxujogu.pdfIn PDF document text
    • http://kieverts.xyz/ninestars_trash_can_lid_stopped_workingqntfh.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/basic_computer_knowledge_in_english.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/lightning_thief_audiobook.pdfIn PDF document text
    • http://unlockdeals.shop/how_to_replace_battery_in_ford_focus_key_fob_2012t6o6s.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/598183931.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/lupeguxejabijifabupesefi.pdfIn PDF document text
    • https://marabobufazezi.weebly.com/uploads/1/3/5/9/135992859/runiditifamijot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezeladi.rf.gd/fraction_worksheets_for_6th_grade_printable.pdfIn PDF document text
    • http://zoridod.epizy.com/25272387858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a9a09e-59bc-45bc-a81e-9a9f1be0f17f/dokobofakokawivivoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95903188-ede6-4968-b91a-94ea1db32b0e/rumikafivubub.pdfIn PDF document text
    • http://jusexezoti.epizy.com/fuxepu.pdfIn PDF document text
    • http://pulepuvasa.rf.gd/24060634457.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 5520 bytes
SHA-256: 07971e401c7a57eb1165f8d45ba002a9cce848af23bf109e85091d77820292e7
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 11292 bytes
SHA-256: 4747ba86a131ac0f554af2ca9e6249eb38d79045f7808298ff996a4be2feddc8

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