Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3af14248024498…

MALICIOUS

PDF

83.6 KB Created: 2021-06-06 09:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a79694fb63ef6ec082a0f8e34857948c SHA-1: 68bf209c6300028661068e1b7fead0121831ae3b SHA-256: 9f3af142480244988ccc6e84f66454e35e6c29e66044128fbce3ca43480386ba
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, suggesting a link farm designed to redirect users. The presence of a URL with 'utm_term=best+calendar+app+ios+android' indicates a lure to disguise the malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://baarspo.ru/123?utm_term=best+calendar+app+ios+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464709/normal_60602a0927d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_604cf7f64ae41.pdfIn PDF document text
    • https://muwemobivom.weebly.com/uploads/1/3/0/7/130776082/tizenedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421214/normal_60b7dbe39faf3.pdfIn PDF document text
    • https://zibamikalizofu.weebly.com/uploads/1/3/1/4/131409526/mozabalisoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_6065d49abe24a.pdfIn PDF document text
    • https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/8090986.pdfIn PDF document text
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/jolinebutudakug.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4385848/normal_60b2ea3b6ae8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_600b4aff35a5d.pdfIn PDF document text
    • https://suwanofanezelon.weebly.com/uploads/1/3/1/6/131636577/tetapiku_xoribefepotema.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5ff1c57bd2ecd.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/606da01b22d66ac.pdfIn PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/900870b688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_600b02030b269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450506/normal_5fe2b61973272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144521040/afghan_jalebi_ya_baba_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4d6c42-4426-470b-bd7f-7a617faf55b0/toto_toilet_seat_replacement_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f67fcf-3709-4782-b437-31fa2a8fdf62/70472164638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a8c9ee-dbbe-48df-9a24-c7e3b5021f2c/what_was_government_of_india_act_1935_4_marks.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/management_decision_making_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda82a8a-f415-4647-955e-910398a1f66a/3795782991.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/read_law_of_attraction_books_online_free.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144444561/a_thousand_years_piano_solo_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9eebdb-a534-46b5-9621-ab4a7cb49146/38035178086.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144521307/microsoft_sculpt_ergonomic_desktop_keyboard_setup.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_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 5116 bytes
SHA-256: d8755075140e61ada2bbc816edc036ad0f4b21325308ce5014d0d538769b2daa
font_01_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 10852 bytes
SHA-256: e22865511b782ce6676e8737e31997dbeb8707e3460ecc46b0708763dc9eabd6