Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f606999b073349…

MALICIOUS

PDF

79.6 KB Created: 2021-04-18 07:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b088e020d1aa8cdb9e17dbd092b66753 SHA-1: 2c023d7ba8d9a01e90f0f2addbcd7e8761928f2b SHA-256: 10f606999b073349e39483e6f54327dd215914f2c2c506d47582a7bcd017f268
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary malicious URL, disguised as interview questions, is a strong indicator of a phishing or scam attempt. The ML classifier and ClamAV detection further support the malicious nature of this document.

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/strik?utm_term=common+interview+questions+for+health+care+assistant
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/7775702.pdf
    • http://nenegifivujaxu.mypressonline.com/rachmaninoff_piano_concerto_2_piano_solo.pdf
    • http://nebuxopav.mypressonline.com/sojumobuxikunodozuvewidut.pdf
    • https://cdn.sqhk.co/linotepibubi/idjbBhd/creative_arts_therapy_jobs_near_me.pdf
    • http://kigumelez.medianewsonline.com/flowers_for_algernon_complete.pdf
    • http://farunoraxukiz.getenjoyment.net/63175200293.pdf
    • https://cdn.sqhk.co/kamavedes/gjdiet3/five_ten_mountain_bike_freerider_contact_shoes.pdf
    • https://cdn.sqhk.co/xorudonox/jdbTieP/scary_granny_mods_horror_house_escape_apk.pdf
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/2957867.pdf
    • https://cdn.sqhk.co/fadejiweruw/yiaSLhg/42611258659.pdf
    • https://wivetagimogik.weebly.com/uploads/1/3/4/6/134618772/c1bbe24e839075.pdf
    • http://lakujalinifibo.mypressonline.com/apprendre_l_anglais_facile.pdf
    • http://dokaxirugik.medianewsonline.com/amartya_sen_capabilities_approach.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bemuvarewu.onlinewebshop.net/train_tatkal_reservation_form.pdf
    • http://zisukuvi.atwebpages.com/programa_free_to_word_converter.pdf
    • http://rizinesuri.epizy.com/guess_brand_logos_level_165.pdf
    • https://s3.amazonaws.com/gazitif/kekovut.pdf
    • https://s3.amazonaws.com/jejulurowev/54040598849.pdf
    • http://pexofapu.myartsonline.com/bacteriophage_genetics.pdf
    • http://besipopi.epizy.com/vidmate_apk_old_version_softonic.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_off0000eae7.bin
75f8615752bbb29404fdb81f7bcbd305dfca065d4dd919c35abf53cc80de64cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 5304 bytes
font_01_sfnt_off0000fcdf.bin
bd2fc73730759f25a565bd965810198f6931e962d834c56003f97d4dc4cc2ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 11112 bytes
font_02_sfnt_off00012290.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 4324 bytes

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