Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33d344625f0dbf1…

MALICIOUS

PDF

69.5 KB Created: 2021-01-23 06:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 718b9bcc5b04d359117fe61cdf390d7a SHA-1: 121bcd7bbaf4fa9e5271185a93eb80acc8bbcfc1 SHA-256: b33d344625f0dbf1f7ae4157290d848db0563ea495afa50f3ae3fbcb4caa625c
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs, such as 'https://crophysi.ru/aws?utm_term=badmash+film++mp4', are designed to lead users to harmful content. The ML classifier and ClamAV detection further support the malicious classification, indicating a phishing or trojan distribution attempt.

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
  • 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://crophysi.ru/aws?utm_term=badmash+film++mp4 In PDF document text
    • https://cdn.sqhk.co/sezogitov/9vhhHYP/istanbul_opera_ve_bale_festivali.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/khbxhgq/kpop_girl_groups_popularity_ranking_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sanozusu/ijhflAr/49332798810.pdfIn PDF document text
    • https://site-1172255.mozfiles.com/files/1172255/dadenutexugupituzuxoxas.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/hvBiigE/safeway_horizon_drive_grand_junction_colorado.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/g8hjggR/dikoraverozigogapin.pdfIn PDF document text
    • http://sosunimepewe.22web.org/60372208303.pdfIn PDF document text
    • https://site-1173140.mozfiles.com/files/1173140/game_center_download.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/igejAJh/kush_tycoon_pot_empire_apk.pdfIn PDF document text
    • https://\/a10.gaanacdn.com\/images\/17\/1833617\/crop_175x175_1833617.jpg,albumartwork_large:httpsIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botozagelexi.rf.gd/zidudobajinozufu.pdfIn PDF document text
    • http://tolamepaduxeju.rf.gd/swot_template_free_word.pdfIn PDF document text
    • http://daxepusiz.rf.gd/ac_joint_pain_exercises.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/bksb_maths_initial_assessment_answers.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/zubusanulebala.pdfIn PDF document text
    • http://jegowijuvu.epizy.com/ny_times_crossword_answers_1124.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 5320 bytes
SHA-256: da888653d022701d200874cd3452eef7dc33ce6b8d3fdb1df007d685955914d5
font_01_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 11212 bytes
SHA-256: a7159aeb6a4650106417e3dea39be86d89f0833706035f6d7b49bb5ab9e803d8

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