Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f7b58ec84484c9…

MALICIOUS

PDF

80.1 KB Created: 2021-04-26 08:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cc1f9c5b1661aba046d341125f1ca05 SHA-1: 70f8c96c2d34a964bbf5195694d1cb12d7354373 SHA-256: 80f7b58ec84484c908daa677c4ffb61afca87a26d4379f859407663fd83e2d35
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' of 30 external PDF links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and external link farm suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=misbehaving+richard+thaler+audiobook
    • http://dokakepitizix.medianewsonline.com/market_segmentation_targeting_and_positioning_examples.pdf
    • http://vipadminler.org/the_collector_book_summaryfudmw.pdf
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5ff7584e0f957.pdf
    • https://cdn-cms.f-static.net/uploads/4387703/normal_602b6b89b507e.pdf
    • http://vashe-zdorovie.xyz/can_i_use_my_battery_charger_as_a_battery_tender1drd8.pdf
    • http://zunuruxeguxifi.mygamesonline.org/angeles_y_demonios_free.pdf
    • http://rofogukiluvupu.mygamesonline.org/kufinigokeruzovibe.pdf
    • http://help-copyrighteamservice.com/low_cholesterol_diet_aha9z9qw.pdf
    • https://gerogebu.weebly.com/uploads/1/3/1/6/131637886/3921681.pdf
    • https://cdn-cms.f-static.net/uploads/4446925/normal_5fd9b6cb8300e.pdf
    • http://fibisazorowax.mypressonline.com/ocean_of_books.pdf
    • https://cdn-cms.f-static.net/uploads/4463526/normal_6017aa61dd437.pdf
    • https://nabezaxe.weebly.com/uploads/1/3/4/8/134852032/rikibuxapoja_rinadoguz_fevupovepog_sokifisarobofu.pdf
    • https://cdn-cms.f-static.net/uploads/4460048/normal_60401cf73f20b.pdf
    • https://cdn-cms.f-static.net/uploads/4503787/normal_603aca8f33430.pdf
    • http://aicberg.net/ninety_six_high_school_staff00jgi.pdf
    • http://edayafar.xyz/xomepijalo4jdpy.pdf
    • https://cdn-cms.f-static.net/uploads/4490524/normal_600dfc6f0117a.pdf
    • https://cdn-cms.f-static.net/uploads/4416654/normal_605d1fc20136a.pdf
    • http://fobativ.mywebcommunity.org/foxitaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://resisimokopi.epizy.com/46407291562.pdf
    • http://bekogufepe.rf.gd/french_dictionary_audio_pronunciation_free.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_off0000e99a.bin
31230fd6a5a108caa710bc416d8ea24b57ffd384ab64f741c526e7c7009a99f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 5352 bytes
font_01_sfnt_off0000fbc3.bin
8a2a0940fd3cb029e20d193f5252f1961ccd3ff0067bf0ffe3e2458a4051df28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 11860 bytes
font_02_sfnt_off000122ef.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 4324 bytes

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