Malicious PDF — malware analysis report

Static analysis result for SHA-256 488ac01ba8944987…

MALICIOUS

PDF

76.5 KB Created: 2021-06-01 12:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 11209e3097f1b367e6b64b11b84a999f SHA-1: bc5f1526e1d2b30f60edcc8cbd679c52588daf1d SHA-256: 488ac01ba8944987d04fab7bddd687d72944b30da5ec3a0ce61c57ce2dbe8999
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/pbw?utm_term=how+to+make+dunkin+donuts+caramel+craze+iced+latte PDF link annotation
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/06e5e61fd0be.pdfIn PDF document text
    • https://suxasamivozafe.weebly.com/uploads/1/3/4/7/134705269/zasepilopetep.pdfIn PDF document text
    • https://xajasobuz.weebly.com/uploads/1/3/4/8/134861619/ruzimukub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_5fe9b3e3ecbd9.pdfIn PDF document text
    • https://tidovikazixuwuj.weebly.com/uploads/1/3/4/3/134316919/sugaxiluxum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_605c101cccb43.pdfIn PDF document text
    • https://tadiseregofinu.weebly.com/uploads/1/3/4/7/134748358/puledewitaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_601bb3fbcc041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_605059be46b91.pdfIn PDF document text
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/nadabosovikut-rufibiwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fe055fe63ea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5ff8b7120419f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_602bdd5f2427e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369802/normal_600044eb4d1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_60598665c8b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_60327eb3be959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_60386de781a10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niluputevi.pbworks.com/f/podeviwikajawexademi.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/algebra_word_problems_with_solutions.pdfIn PDF document text
    • http://vosebim.pbworks.com/f/bridget_moynahan_films_list.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/f/here_comes_the_sun_piano_sheet_music.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144418680/busulor.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 5252 bytes
SHA-256: 019e29ced247193af52e7e48b92c0155a3550d3aa0ff4f8d744ac188fd03334c
font_01_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 11344 bytes
SHA-256: 9e0e2695458b10920e0c605e95d43781e522fd6f67f6363486612cdbaab45cec