Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2ce1592021f075…

MALICIOUS

PDF

78.2 KB Created: 2021-02-20 10:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 952806cc65842f311dda1f347afc1ffd SHA-1: b843f32e1b5478a7f3e2f3a4de7eb61f0753d210 SHA-256: 1e2ce1592021f0759c005be94fe2a5d4f87ee89101d25dc66b001549ebd1d60b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirector services, indicating a link farm designed to lead users to malicious content. The primary URL, 'https://crophysi.ru/aws?utm_term=cobra+19+ultra+3+installation', suggests a phishing lure related to software installation. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=cobra+19+ultra+3+installation In PDF document text
    • https://cdn.sqhk.co/zudilubal/K87jh4Z/wasidezalaloxavobakep.pdfIn PDF document text
    • http://jixuvofariva.iblogger.org/south_park_the_stick_of_truth.pdfIn PDF document text
    • http://mawobireti.iblogger.org/bajesiraxigexapis.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/Sjahiij/31873529722.pdfIn PDF document text
    • https://cdn.sqhk.co/nemovofa/245jcif/free_jibjab_halloween_cards.pdfIn PDF document text
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/4433223.pdfIn PDF document text
    • https://lamalirigade.weebly.com/uploads/1/3/4/5/134595912/5393167.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/iehh6uM/sup_multiplayer_racing_mod_apk_v2._2._4.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/dYXxctJ/dragon_age_2_warrior_weapons.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/0EkhjVx/36501704998.pdfIn PDF document text
    • http://konujojijitezu.iblogger.org/2854751631.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvuzonowokogu.rf.gd/vepapugulebuvorerus.pdfIn PDF document text
    • http://lokokojorivumi.rf.gd/cara_install_android_sdk_linux.pdfIn PDF document text
    • http://gevalej.epizy.com/brick_breaker_mod_apk_revdl.pdfIn PDF document text
    • http://davutawopoban.epizy.com/report_car_accident_qld_police.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_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 5096 bytes
SHA-256: deddd30a6f48077c17e54fe8fb066acd9ca29294a378fa9871673be9d65cf440
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 10976 bytes
SHA-256: 46cd24a66ffa34a3693b78e4fe5f4e3bc1ca0700b32cdeb4a40c7f538c9cab99

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