Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b89f5d7b042e3c…

MALICIOUS

PDF

78.8 KB Created: 2021-05-09 15:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c9a8605439df2bf9653a81d7a3945777 SHA-1: 27fce3d618b913b0686665318856205c7f455404 SHA-256: 67b89f5d7b042e3c836f6c4d1a1f5d6fff42f307e4267a7929d9cb8adf93bebe
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with heuristics indicating it functions as a link farm and redirects to malicious infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam campaigns. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=cuales+son+los+diferentes+medios+de+comunicacion+que+existen In PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/gelewilubobu.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/gieUghv/ringtones_for_android_phones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/flutX4g/weekend_getaway_near_manila_for_family.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/tefoses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_600dcadf635ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_603e836a43b30.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/hgxifeG/zakuposavegopovipad.pdfIn PDF document text
    • https://tabanaxil.weebly.com/uploads/1/3/1/8/131857193/c92571767427.pdfIn PDF document text
    • https://cdn.sqhk.co/babakobesuxe/Bvaoibe/femiwimefeluwavufufapukip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367290/normal_6002b90625664.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/eQidZgi/exhibition_catalogue_template.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/gfiaFhg/comedy_central_app_not_working_on_firestick.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_601dca8242279.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/dhchaJs/pocket_soccer_league_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/iEDQ0ii/offline_games_free_download_for_mobile_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/b0XfJFo/dexexuwidowewas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nasujaguza.epizy.com/short_detective_stories_for_middle_school.pdfIn PDF document text
    • http://juxenemijoguku.rf.gd/alone_together_ebook.pdfIn PDF document text
    • http://simarifanudus.epizy.com/50216478281.pdfIn PDF document text
    • http://xozinosawadijak.rf.gd/tenowixas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 5264 bytes
SHA-256: dc3b7a74fa562ba8ee1c9671f284c7e80dde7053d0c0769d1676a342a4327daf
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 11216 bytes
SHA-256: 2438daff607d3e0c069c6b181a35c6d58936538386db33ee5935b5a585dbd480
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378