Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c1ad091afbeaf4…

MALICIOUS

PDF

75.2 KB Created: 2021-02-10 16:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c50d44101d447af53e95e6c1b9643bd9 SHA-1: f581e6883e8dd136c4da930822b258d006ba00b4 SHA-256: 37c1ad091afbeaf41ea7b8ed4bbb71e73cdcecd7ee5ce33a29b81eb53c8154cc
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, forming a link farm, with many pointing to disposable hosting services. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to direct users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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=android+games+offline+high+graphics In PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/0ce810c553bde9.pdfIn PDF document text
    • http://prosale.company/lezexoxuzeliruzl23sj.pdfIn PDF document text
    • https://kinajerabisar.weebly.com/uploads/1/3/4/7/134748515/labemasaladu.pdfIn PDF document text
    • https://nagajaburelu.weebly.com/uploads/1/3/2/7/132740350/rowurug.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/nasibapetuxup-xiwemenakixajom-biwamufisuji-wagegasitorama.pdfIn PDF document text
    • http://espaceabonnes.com/cuadernillo_de_comprension_lectora_tercer_gradogaz2x.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/xetidefevu.pdfIn PDF document text
    • https://pizugonuju.weebly.com/uploads/1/3/1/8/131856050/pugunixowowamodevow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5ff5c3637784d.pdfIn PDF document text
    • http://prostochillforum.fun/rasomonotafunurala6zhm1.pdfIn PDF document text
    • http://wonder-ita.fun/32763364283m151p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5ffb0db957d3d.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/f6ec2d5f3de.pdfIn PDF document text
    • http://spindlndou.space/masha_e_urso_portugues_portugalkl4ys.pdfIn PDF document text
    • https://gumevimarijefa.weebly.com/uploads/1/3/1/0/131071167/6480914.pdfIn PDF document text
    • http://snatural.space/wonder_woman_helplesskahe7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/14928841000.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/cooking_verbs_vocabulary_matching_worksheet_1.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/debate_about_school_uniform_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/24977538614.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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 5556 bytes
SHA-256: 4397ff4f630aeaecce084aa0e3eb5b36fca547390b21e0dff8130a769a291bf3
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 10252 bytes
SHA-256: f1eaf759203028a07419714f96941d34072939a54cfbc548b7015bf865caead0