Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13cdea4527d333c…

MALICIOUS

PDF

86.4 KB Created: 2021-05-15 09:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0cda29cd473786ff0caacfcce593c557 SHA-1: 779ba30a1500cb57516ac0e0777001577556e724 SHA-256: d13cdea4527d333ce924e5f4fb6e8bd1441ea0e9fc33d2dfe639730387114874
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The file also exhibits characteristics of a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://yafferge.ru/strik?utm_term=emergency+medicine+residency+lifestyle+sdn In PDF document text
    • https://cdn.sqhk.co/fewesiwe/La5geeN/beclomethasone_formoterol_as_maintenance_and_reliever.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ojejhkH/tojenodanedasebi.pdfIn PDF document text
    • http://losabaletolo.22web.org/92627714903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_60498a9c7ee0b.pdfIn PDF document text
    • http://technodom11.com/45401456221tedtz.pdfIn PDF document text
    • http://demask.space/chauvet-_pro_colordash_accentx1afa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447487/normal_5ff55dc99fc69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_604e4db9dabac.pdfIn PDF document text
    • https://cdn.sqhk.co/xajegakagiz/6t3ogdf/duzukeroni.pdfIn PDF document text
    • https://cdn.sqhk.co/bewamufara/hN02ge5/wedibu.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/hgKKAkk/cnc_machine_metal_price.pdfIn PDF document text
    • http://propovar.ru/nosodoregafayd4.pdfIn PDF document text
    • http://blu-ital.space/66564217964t030l.pdfIn PDF document text
    • http://nat-yoga.space/najovotaxurguxam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefemopu.epizy.com/bilanzen_erstellen_und_lesen_fr_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a47d9d-e123-4e93-a88d-ed63a729053a/luwobewulitalafuduz.pdfIn PDF document text
    • http://kafodesojokefe.epizy.com/vocabulary_words_for_grade_1.pdfIn PDF document text
    • http://laguzovola.rf.gd/sears_garage_door_opener_replacement.pdfIn PDF document text
    • http://gabepan.epizy.com/nifotawekifikisosor.pdfIn PDF document text
    • http://fibafewupo.epizy.com/wixevagiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a0a700-2a8b-4428-817e-c34850494e6b/el_poder_de_la_oracion_oscar_medina_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d9ca83-0446-4fdf-bdd8-ca9c03521be9/america_a_narrative_history_10th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d976c82-0123-4629-8ddf-2880e9c17506/a_general_theory_of_love_thomas_lewis.pdfIn PDF document text
    • http://jemibare.epizy.com/bipagelota.pdfIn PDF document text
    • http://kilibuv.rf.gd/psychology_book_class_12.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 5188 bytes
SHA-256: 1469e06e09f36704090c437ba43ec083841df892fb3e696e48386808ec0342b7
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 11140 bytes
SHA-256: e4a8c6a8db49dbabc9c2be26c59817a8145fe52eefe78aded1d3464a01e5e19f
font_02_sfnt_off000136d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7