Malicious PDF — malware analysis report

Static analysis result for SHA-256 607c952d18c7350f…

MALICIOUS

PDF

82.6 KB Created: 2021-02-21 17:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 012ebfa4f43804a68efedaea271b0cf8 SHA-1: e4a4f582ef95fde9262229078315febcee854e46 SHA-256: 607c952d18c7350f7543c80a916135f2658348ff6f5e642382a7ca6fde2d0eee
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'https://crophysi.ru/wix?keyword=iglesia+de+tiatira+historia'. The presence of a large number of external links suggests an attempt to manipulate search engine results or redirect users to potentially harmful content.

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://crophysi.ru/wix?keyword=iglesia+de+tiatira+historia In PDF document text
    • https://kaxudafesin.weebly.com/uploads/1/3/4/3/134355678/gufureb_xopafom_lomif_dawixaguzatave.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/V22c2om/hero_rescue_rope_puzzle_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/ghifKQg/maxav.pdfIn PDF document text
    • http://daniele.store/fufapitetuvixilotanatinuzjlu3.pdfIn PDF document text
    • http://kushtanash.ru/drift_clash_mod_apk_revdlifbuk.pdfIn PDF document text
    • https://tevipane.weebly.com/uploads/1/3/2/6/132681072/pukomagejo-xobotujupa-lupama-vimamuxuloxu.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/p3xlEia/calculadora_de_iva_online_chile.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/tabekabet.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/doTnD2d/water_slide_3d_mod_apk.pdfIn PDF document text
    • https://supogile.weebly.com/uploads/1/3/1/6/131606666/735155.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/1Oagjjc/gipesuzubuladen.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/379101.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/iffcChe/pixilulatumememuf.pdfIn PDF document text
    • https://murimuwisoruda.weebly.com/uploads/1/3/4/0/134017177/fetarif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiwenufaxo.epizy.com/jejopafoxujag.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_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 5024 bytes
SHA-256: d6974dad9b5b1f55c8cd72c40f47b760e21e1aeb1955ed9571f7fdc71b0d4be8
font_01_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 11560 bytes
SHA-256: d09bac24b33ad4088f283132e2e4f0613a61f4aca58baf69406fa26e9215c9ef

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