Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92d2dcaf4c52a4e…

MALICIOUS

PDF

66.3 KB Created: 2020-12-23 10:19:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1505a1c340bc9a368a902f64611b2386 SHA-1: 71db9292fc7dccbcfe585468c0b983757c237cf8 SHA-256: e92d2dcaf4c52a4e7c581eb0655eb905a83602fc1d4f918dc2e365c538cd0e17
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=types+of+context+clues+worksheets+with+answers In PDF document text
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/4977289.pdfIn PDF document text
    • https://zunitilamurako.weebly.com/uploads/1/3/4/5/134529552/vojofoxuragokodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469353/normal_5fdf77a0b8cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f89674008987.pdfIn PDF document text
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/pozuwipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_5fad5dc5ac807.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/9005439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/693a034e-58ab-4c4c-af85-219b8694a7e6/conan_the_destroyer_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a1a1bc-9b10-4ee5-a550-a38a9bc7e0f7/31784019747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b8a0b4-c7a7-4fc4-bdbb-09a198f19ed4/zadidixafipimenotupedisa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdff5901091525336564164/t/5fe09709d85ca2644235d80c/1608554249094/10043563686.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe271a95ddc597cb220ed83/t/5fe2ad5ac1d94545323f76ed/1608691035072/site_and_existing_conditions_report.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_off0000c87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 5380 bytes
SHA-256: c320fbb649d42d30fff39ee2c223d8ccd71369e77da520324c23f7a2985cfbd7
font_01_sfnt_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 9904 bytes
SHA-256: c24516f61d4a3c93a6604fe353d43a45d2bfae3caa941ffd3cba3582b4b3c7be

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