Malicious PDF — malware analysis report

Static analysis result for SHA-256 34662ae18ff095c5…

MALICIOUS

PDF

87.0 KB Created: 2021-06-08 20:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8d1cd1e063967e8a0cb83c542bba8230 SHA-1: 33edd00e1bbb549d8559cd4d488735377b1d1df4 SHA-256: 34662ae18ff095c5d41ca61da450f7dd5d36afed97f0b923ae69586461304b49
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to manipulate search results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/pbw?utm_term=kk+emoji+keyboard+apk PDF link annotation
    • https://wotipufa.weebly.com/uploads/1/3/1/0/131069738/pobexava-mupudexoteg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_60519e4031dd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393898/normal_5fcb2b7c72423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcc2d0edad02.pdfIn PDF document text
    • https://nilazarokidimud.weebly.com/uploads/1/3/4/4/134495838/3902782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_601e2261505ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_602014372c201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_601d6ecd0a9d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_605205a6518b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375896/normal_5fe551c3883ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezeliv.pbworks.com/f/viveputel.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/w/file/fetch/144813114/43527122336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce4305f-0d4b-4336-a9ae-c997ab245843/flowers_for_algernon_theme_handout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d3dd3c-123c-47cb-b2a1-85a0faa3b3d9/can_you_get_goat_simulator_on_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305cc39e-14a2-45b9-a092-fb4dc2dc8793/tatevaxagegazararezawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c9e259-537a-4a65-b679-4af14949408c/baby_einstein_sea_dreams_soother_crib_toy_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa184ee-8dcf-4024-bac8-dd312484e60f/76642643375.pdfIn PDF document text
    • http://duwaxifu.pbworks.com/f/kopapawogogexik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35cbd8d9-8cb4-4239-8c38-55f643b61879/44014076608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf42cc68-5170-40a2-acd5-a05a05330104/serupazadosavotetu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 3256 bytes
SHA-256: 1bb4bea84c88c8be131b41ba4bbc85319a38170084eb231ca7a0b58d74227db5
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 5244 bytes
SHA-256: 5c877665d7ef2221acbdfe0217d8997ffa005cfd2eb582cb0c39588a6ce72955
font_02_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 12912 bytes
SHA-256: 73366f3c64cd2e78f8ca63a73e5d97ceb0e3656320e080e3e26f1b6e98e511b7
font_03_sfnt_off0001390a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390A 16160 bytes
SHA-256: c9a6dc902185007e8b0991b36499e2016605a6cc8ed0e3178f37544fffabd01e

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