Malicious PDF — malware analysis report

Static analysis result for SHA-256 9380c101e3c0636b…

MALICIOUS

PDF

81.1 KB Created: 2021-04-05 15:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 343fb053130ea7c0b2ce02b1b33b8744 SHA-1: bb0f79fa0ddf7af2646399613b759a920afea276 SHA-256: 9380c101e3c0636b2a3cf57d7a0753b73f561c3b700f87832d7aac7f4d39161a
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO content, pointing to a redirector URL. This indicates a link farm or phishing attempt designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/award?keyword=lexique+allemand+fran%25C3%25A7ais+pdf PDF link annotation
    • https://zefopezonokav.weebly.com/uploads/1/3/1/3/131398054/1446366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_6058d8f1743ba.pdfIn PDF document text
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/lejazixigime-pexisawuko.pdfIn PDF document text
    • https://kikobuvikivevir.weebly.com/uploads/1/3/1/4/131437815/1231557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_60329d89d96f4.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/724a5e0c7b1e385.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/2630710.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://s3.amazonaws.com/mosezavor/23582874652.pdfIn PDF document text
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_eff9816bc2074b3bb7eab45b6ce32c5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/fibidowidefuzelulogilo.pdfIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_b847bcbe523d42e48dcb644bd74439f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vigevot/womens_schwinn_suburban_deluxe_26-inch_comfort_hybrid_bike.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/minolta_camera_mn35z_review.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/how_to_save_final_cut_pro_video_for_instagram.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_12206fcfa4874ce583f6c2c0b8d0e978.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/sennheiser_rs_175-u_digital_tv_wireless_headphones_review.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/rinizigekuvujibiwulupa.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_64fd831a35e945d9a89e974d26f850ca.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_427fd4d0c83446a9a0341940c8d9f89f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savifin/jodurixarozapiwarulutomo.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/edward_albee_whos_afraid_of_virginia_woolf.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_d0de0b73763f41eb837959c3d637c4b8.pdf?index=trueIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_459322edf02f4d3da07f797fb26508b2.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_4b54fd22da2f4e99b3e831b1e76b1367.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 5196 bytes
SHA-256: e73c4b32edf9ad29000f666674591a79bc6fe1f58fc8f1061dac357e33f67143
font_01_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 12704 bytes
SHA-256: bc03cbb3cdc6b468411348c4ac303044857cf535662392302933be9943e8e7ed
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361