Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a277d9147a65d66…

MALICIOUS

PDF

96.1 KB Created: 2021-04-26 01:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fa55daa5089cbb7456b4c5ce53204a58 SHA-1: 281b6a3fcb0f6a8134854597e88b9de62654164d SHA-256: 9a277d9147a65d66f84351e6b87b4397064957bea60a4186474f3756e433ab1d
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and redirect to a URL that appears to be a phishing or malware distribution site. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/strik?utm_term=ge+roaster+oven+turkey+cooking+times PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451954/normal_603d1d9cb0dee.pdfIn PDF document text
    • https://tubekari.weebly.com/uploads/1/3/1/6/131636965/zatirujoxuwenad_rimekudatevono.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/custom_airbrushed_air_force_1_shoes.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/36509268553.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/c030c1faf8.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/ivmZhg7/dave_letterman_top_10_lists.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/kalinarixojogobub.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/a9hbZic/76255940174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_600a403e351d0.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/gjYbhea/twisted_tea_calories_can.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/iciephc/zikeboravafuzereles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6021f8cd4c9f2.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/bd891b45ed.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/ebf58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470207/normal_60294eef36211.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/kung_fu_hustle_english_dub_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/4ggKujj/8661542502.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/9277692024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_e861b72c963b4687a01e457cfbb75126.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_e55a0aa2ba134ecab869c1043da5e3d3.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_dead7f306949454fa255a89a2e576178.pdf?index=trueIn 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_off00013a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A09 5344 bytes
SHA-256: 39ada314cfffe39d2d529ccbbea830b14f40e46acf6b15427378958dae32387a
font_01_sfnt_off00014c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C37 11436 bytes
SHA-256: 0e65836f8ca41589da18d9be8b5a7db12c10cb708101374d649c507d8b788397