Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d2b3d4132234d0…

MALICIOUS

PDF

93.2 KB Created: 2021-04-26 10:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 061ca81cf380e88fccd575912494fcd2 SHA-1: c9118b9b254057eaf5e9e521bf1bb9c785490b8c SHA-256: 31d2b3d4132234d0a4addb4ea6b13bf87206dfd7797bb1f72a47b87c5dbea3cf
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors designed to lure users into downloading further content, disguised as a mixer manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing unwanted software. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://dugedepap.ru/strik?utm_term=behringer+xenyx+x1222usb+usb+mixer+with+effects+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5fdf923b042cc.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/tefexot_xapadekenoj.pdfIn PDF document text
    • https://nakoginav.weebly.com/uploads/1/3/0/7/130776809/3f203a0ba13.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/10600458765.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/bejefubesovesokeni.pdfIn PDF document text
    • http://simcars.ru/sonixowm6aw4.pdfIn PDF document text
    • http://antonioita.fun/how_to_tell_if_someone_is_isfj_or_infj5wtqw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6038215e3c8f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fdb00fcf34ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_60543a2f729bc.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/37794382498.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/rulaje.pdfIn PDF document text
    • http://reweder.site/data_warehousing_jobs_in_singapore2ey7e.pdfIn PDF document text
    • http://formblckr1.xyz/2019_ashrae_handbook_hvac_applicationik2a.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/fetadiwewud_kozas_tirono_vozetawajetilo.pdfIn PDF document text
    • https://tewijudejasivi.weebly.com/uploads/1/3/2/6/132682467/81a6e440099af.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/al_ansari_exchange_app_apk.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
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_b420745fe7b4484597f1c419d08b4435.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbd5c0c-40bc-49f6-a487-6df5f39b1418/washington_post_games_page.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_d0a2501a2f75471480e9c1d73efc55ee.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_92af6516807d4e2e8b35d9feccecfa6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/055332fb-e6ee-45c3-8100-4df964112751/for_beginners_how_to_draw_girl_anime_manga_face.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_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 5700 bytes
SHA-256: b91ecfe5fa3fe7051840303f00f726ff6d63080c98871ad36f2cd05830100312
font_01_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 11384 bytes
SHA-256: a03cf125032fc19906402119f7b7275a49a49b247af31b65c8622f2c3c7601ed
font_02_sfnt_off00015857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15857 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e