Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd42616c8c40f05…

MALICIOUS

PDF

73.1 KB Created: 2021-03-08 06:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4c8c6ab244c1146b00c402608ce71a79 SHA-1: 8ca928b983a19afe2e66e2e4d8c972ec17f59605 SHA-256: dfd42616c8c40f052473639a110292263caee5242f0180e1a8013233b4d53d38
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/strik?utm_term=phrasal+verbs+common+list PDF link annotation
    • https://cdn.sqhk.co/vumusokutil/BjbieJO/laws_of_the_game_2020_21.pdfIn PDF document text
    • https://dunudodijozu.weebly.com/uploads/1/3/0/8/130813966/e5874ddd.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/79nOhfz/78163421275.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/Lbibgg1/wulijux.pdfIn PDF document text
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/vozajojugebud.pdfIn PDF document text
    • https://torewofatovamek.weebly.com/uploads/1/3/4/1/134108613/3d6721.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/igJje0r/41936702336.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/simple_human_soap_dispenser_red_light.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/bezebekekizabofanoredere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_7ad390fa603e4ea6a67392fad8af439f.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_08de2aee3a78438fa883a90fa2c4b671.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_6bcb51c596be42ef80fe9b91ca7ca5fa.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_88d74299c619430fb4552c3b159ff88d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/niralejatimu.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/gram_sachivalayam_hall_ticket_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/nemolo.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_48ba8c99c984414ebf48748a0ae83b2d.pdf?index=trueIn 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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 5240 bytes
SHA-256: 975eba758fa5063090582814631dd407e1d74461d278559153d411652d94c436
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 9828 bytes
SHA-256: 374943dbb79810b610bdc67dcd4ff2900e6b24db3e42cdeb3e93a3baecc643b6

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