Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4167b6cd762e6f…

MALICIOUS

PDF

85.0 KB Created: 2021-02-16 17:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b623deaefe38876d3624b49ad43b50c9 SHA-1: d83f50dce531e1c1266ce56e44eb798098db1d74 SHA-256: fe4167b6cd762e6fbbe0fa466c8c86c5c95cb3218ffd57954af3a0fd4866a64d
186 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 PDF_SEO_LINK_FARM rule indicating a mass of external links. The ML classifier also assigned a high probability of maliciousness. The document contains numerous URLs pointing to various domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the presence of many external links and the ClamAV detection as Pdf.Phishing.Trojan indicate a phishing or malicious content delivery attempt.

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
  • 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://druttle.ru/strik?utm_term=difference+between+literary+theory+and+literary+criticism+pdf PDF link annotation
    • http://com-copyrighit.com/jobikukitaxulajurinenavec4ulr.pdfIn PDF document text
    • https://cdn.sqhk.co/migawudewiw/sIjelZB/cyberpunk_2077_wallpaper_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/iaxhdH2/71784729796.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/aRCRygg/stress_management_techniques_therapist_aid.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/e62hdge/zogepoxoko.pdfIn PDF document text
    • http://1xbet-registr.site/wulejugonirejasewoseraziuyttt.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/401b34.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/gcjfib5/fake_gps_location_ipad_without_jailbreak.pdfIn PDF document text
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/gipeviwamovav.pdfIn PDF document text
    • http://seamanygau.best/rijidexowiwaledavuvuglp8yp.pdfIn PDF document text
    • http://carinsusa.com/ashrae_applications_handbook_freeyff0f.pdfIn PDF document text
    • https://jebopisozezir.weebly.com/uploads/1/3/0/7/130739828/ad43cfe66a64e08.pdfIn PDF document text
    • http://cyberghost.store/cambridge_english_starters_1_for_revised_exam_from_2020mj186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5ff1b848bbb4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 5728 bytes
SHA-256: 6e51ce48519f76470a7adcb7e6d4410bfcc862bdb573ef0c38e88a5a798b35e9
font_01_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 10464 bytes
SHA-256: d3697019b3f2eafbf27ef7826e5471f69ed4eb523bc55c36b82544f7748f6d80

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