Malicious PDF — malware analysis report

Static analysis result for SHA-256 773c8464d0aba941…

MALICIOUS

PDF

78.4 KB Created: 2021-02-23 01:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9f96b136987b058f2dc5cfde91f87fe6 SHA-1: 30ec29e44ddc9862a6e4df05c7cf4bcffab2fa45 SHA-256: 773c8464d0aba941acd947f77469caf271430c96dc3d7ed778ba83f5ddb67a74
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the embedded links, suggesting the document's primary purpose is to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=behringer+xenyx+qx2442usb+recording In PDF document text
    • https://cdn.sqhk.co/kagumuzom/ihia4FX/96632034108.pdfIn PDF document text
    • http://rigekuxinitevov.iblogger.org/mobudimur.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/QVuCahc/puxudejis.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/hanc0CE/nbc_sports_chicago_white_sox_rewind.pdfIn PDF document text
    • http://onesmall.space/141628589840f06b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413457/normal_5fec9b48d9fc5.pdfIn PDF document text
    • http://gutprod.xyz/why_do_arguments_happen_in_a_relationshipxy6zj.pdfIn PDF document text
    • http://lifizix.22web.org/samsung_refrigerator_washing_machine_repair_service_center_in_tughlakabad_new_delhi_delhi.pdfIn PDF document text
    • http://yoga-fitness.space/xolupepipazigixibogirasi6u22v.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/hjcjfCa/11142561061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5fe58d6b6feb1.pdfIn PDF document text
    • http://vidapabil.22web.org/97673737484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jutepopoladajol.epizy.com/que_come_la_oso_perezoso.pdfIn PDF document text
    • http://wumevagijez.epizy.com/netagatosomopawonurubalez.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 5468 bytes
SHA-256: 39f80a2cd5ac1b3ed92fe55d66097974f534a7223552170dd6ca205d51ee16db
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 11092 bytes
SHA-256: 111f41c7a30ac7c8496533bee562bc66cd7331569a325e0aae45fc61024b48c8
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.