Malicious PDF — malware analysis report

Static analysis result for SHA-256 99218478b75cee7c…

MALICIOUS

PDF

91.8 KB Created: 2021-02-27 18:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 324edcbc0579b818f413f8a226238e52 SHA-1: ef89b832c5866748a3fb7d6f55320ebf88cb3060 SHA-256: 99218478b75cee7c7a4d1f34f91194a0c06f14566fbed6371e075cffaf51e8b0
184 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, specifically for containing links to known malicious redirector infrastructure. The document body contains garbled text, but the presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=neverending+story+horse+death+meme In PDF document text
    • https://cdn.sqhk.co/mibuguxinise/h7pg3ij/animal_jam_redeem_codes_for_diamonds_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/eC2gcbo/4_pics_1_word_4_letters_fish_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/jgaw4gc/rogifosukuloxusule.pdfIn PDF document text
    • http://fogozuvonuw.66ghz.com/black_boy_haircuts_2019_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_603a5e0ad9642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_600b2ee805d2a.pdfIn PDF document text
    • http://lanejaselisipu.22web.org/bumolozadi.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/4VRx7M6/gonuva.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/dhbbjij/7169315534.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/Nb1hfic/coin_collection_for_sale_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_5fd3315e3a029.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/ubjhhc2/tagipujugujav.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/sQFifha/50682445196.pdfIn PDF document text
    • http://fudasoba.iblogger.org/precios_del_libro_azul_de_autos_en_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/xixumobun/hgjqjcf/crossy_road_piffle_secret_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_602dcb19f403e.pdfIn PDF document text
    • http://brosbass.com/lizisuwilukapepizekarerib4blv7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sijelufuzarolup.epizy.com/fevofodilironadur.pdfIn PDF document text
    • http://fekunowan.epizy.com/widajumiboguvexegi.pdfIn PDF document text
    • http://norilonabu.epizy.com/how_to_add_disney_plus_to_samsung_blu_ray_player.pdfIn PDF document text
    • http://ratazudawi.epizy.com/jotasobududonemibodigez.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/pinonukef.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_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 5336 bytes
SHA-256: 4c80658b7a261ea7c51e749862c9735b1698b787340fecd455f34d0060aed02d
font_02_sfnt_off00013cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDC 10640 bytes
SHA-256: 25e71b8afbd655bb7fc7ef6519753a43777d398dcc31b7934c9f6e56bc6fadd9

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