Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce183b99ca0f438…

MALICIOUS

PDF

85.9 KB Created: 2021-03-14 12:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b65a884eb82fef4d6af434520846937 SHA-1: a5cc0dc19ffa50888d662c0feb392b1d78185705 SHA-256: bce183b99ca0f438883117197aecb505e27fb414a2bfe6609afe34d5eb00a70a
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 domains, indicating a link farm or SEO spam operation. The embedded URL 'https://bologen.ru/award?keyword=betrayal+script+harold+pinter+pdf' suggests a deceptive lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and link distribution.

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
  • 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://bologen.ru/award?keyword=betrayal+script+harold+pinter+pdf PDF link annotation
    • http://barberking.best/ap_world_history_textbook_voyagesqgr2h.pdfIn PDF document text
    • http://elerctum.org/apc_back-_ups_xs_1300_user_manualj8nhd.pdfIn PDF document text
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/vuzor-zagorenemadej.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/pitizujanolam_mufolesix_pezexuduwex_dolexaxurawi.pdfIn PDF document text
    • http://autobuff.xyz/sandhya_namam_rama_rama_pahimam_lyrics_in_malayalamm7qi2.pdfIn PDF document text
    • http://naturaitalia.space/398369748475tv9k.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/675c215fb90785b.pdfIn PDF document text
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/podenamove.pdfIn PDF document text
    • http://fb-copyright-help-from.com/gikazitetikeximawuuh9c5.pdfIn PDF document text
    • http://mavito.online/homeready_framework_homeownership_quiz_answers6uxyc.pdfIn PDF document text
    • http://walletelectrum.buzz/bhagavad_gita_in_english_book_buyukesu.pdfIn PDF document text
    • http://ogranicbio.fun/xenowuxazozemiwotavevl8gj0.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/ceac513c5504.pdfIn PDF document text
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/viseletefogula.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/voxasinimu_mosadumogabeze_zeped_modupenutujevo.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/fdc1de66-43e6-4c1e-93c9-18a2b2b7fb77/fuwatax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4a9377-c3c0-4688-9374-560a686e48a3/osac_mexico_2020_michoacn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998461bb-6c17-4e50-a7b0-6446dedb87f8/64236103666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/793ae097-81e1-412c-9489-9f1c90971aed/pinaponamolabozawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/011ab15d-eb39-4551-8f3c-a3e860aa3b9e/41279128511.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_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 5396 bytes
SHA-256: f2cab4b093bd82105bf945f9eb64efa7bd500dc7d3a5dd325191ae325f3e8312
font_01_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 12892 bytes
SHA-256: 10234761217f21e257cb91896bb79aab6d874819153502de093886d1f55aa6bc