Malicious PDF — malware analysis report

Static analysis result for SHA-256 165b3109be1677c3…

MALICIOUS

PDF

77.1 KB Created: 2021-02-08 11:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5a3cb25e3e32c434907cab09fd3d1012 SHA-1: 7b23bc25a247ba8e48aaa0978fdbc065ded061d5 SHA-256: 165b3109be1677c3e71a27c155f65ae0dfda9ca5bda3728f9f53d5d12a651f27
126 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, specifically as a phishing trojan. The document contains numerous embedded URLs that point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of 'utm_term' parameters suggests tracking or redirection, further indicating a malicious intent to lure users to potentially harmful sites.

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://maypoin.ru/123?utm_term=prentiss+criminal+minds+wig PDF link annotation
    • https://cdn.sqhk.co/zadoweferoxe/sjfhbtA/cooking_fever_casino_stopped_giving_gems.pdfIn PDF document text
    • http://zdorovienashevse.xyz/60873185844uickm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_5fd14150796a0.pdfIn PDF document text
    • https://cdn.sqhk.co/fetebutujo/hjX3A3x/96964754347.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/jdN1wxW/mob_skins_pack_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414495/normal_5ffeb5d931dc5.pdfIn PDF document text
    • http://instasale.company/frontline_commando_d_day_apk_modbah36.pdfIn PDF document text
    • http://medgaj.com/baby_cuddle_lose_imprint_quality_speed_multiplier058y2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_6013c57b84020.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/MjcFgg6/moronufumisu.pdfIn PDF document text
    • https://cdn.sqhk.co/zowipitilo/xiaCijp/mipozixobukaliwejuxo.pdfIn PDF document text
    • http://redtea.space/bruteforce_save_data_ps3_gratis6b6iz.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/bhajgbD/jetpack_joyride_apk_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_5fd11257a8e71.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/hahieFO/41558191103.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/luropiw/turn_off_answer_machine_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/gchq_puzzle_book_ii_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/bashrc_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/34700464472.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/47332048279.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_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 5032 bytes
SHA-256: 11e85adc6cc13061ebdbdb88c232dc072c2df7cb4780f82cecfb5fc1b32778dd
font_01_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 11120 bytes
SHA-256: 8937b8969d751edb3a75935b9b7d59e2a6eb9584a621ca6a179dedc1255503ec
font_02_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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