Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e877590b0d455a6…

MALICIOUS

PDF

89.0 KB Created: 2021-04-26 19:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7923c48ae12b79c337cd502dabf82c81 SHA-1: 9e346a88d375c284b683ae3ef002c636166163d4 SHA-256: 2e877590b0d455a62453ebc46e8600e5009cb1a3ec700b907ccb65631ba56705
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, some of which are likely part of a link farm. One of the embedded URLs, 'https://midufefew.ru/strik?utm_term=innova+3040c+update', is flagged as unknown reputation and is likely the primary malicious destination. The document body, though heavily obfuscated, suggests a lure related to a device update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=innova+3040c+update PDF link annotation
    • http://xafesuvorolivig.scienceontheweb.net/how_to_change_the_belt_on_a_shark_navigator_dlx.pdfIn PDF document text
    • http://cosmeteca.com/gubaloxobakududomirijazg7w7d.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/11602837556.pdfIn PDF document text
    • http://revodegasiger.sportsontheweb.net/an_image_of_africa_racism_in_heart_of_darkness.pdfIn PDF document text
    • http://igafnd.org/waterboss_700_installation_instructionsj7xba.pdfIn PDF document text
    • http://fredo.bike/rerufesapwfv0m.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/40303642831.pdfIn PDF document text
    • http://stroiline74.ru/running_schedule_marathon_beginners83a0w.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/wenobagupexekap/computer_architecture_and_organization_mcq_careerride.pdfIn PDF document text
    • https://a0758896-f8c2-4fc9-8c7e-5c1738e8bc18.filesusr.com/ugd/0ce882_91b1ddc451c54b1f86d306a655051832.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/fashion_report_ffxiv_week_86.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_4e2f7e7786ee4a37a66cc2cb04a409a4.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_200e79376ef34d2887bba0f7b0efdc98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somisilegex/52225508158.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_e22188fb4bb54c8fb42b8ae7d0950ba0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/lunopo.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_bd00d1d731bf4b78be9c19442b3a0c88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/14152859677.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/76696126295.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/bewafai_video_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/nolunejego.pdfIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_ecf40c9ac3b34615be6184915976b5fe.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_8ef1e04f9efc4179ac7fd51168b8a907.pdf?index=trueIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_74ef51b865434d3fbcdd6576d6db0440.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/27014020396.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_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 4988 bytes
SHA-256: 71ba7ae79bec906c9965554bc4351acebb63ff2d77813bcb2243b446a2e4e9e5
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 22496 bytes
SHA-256: 6a1e8b29b28645491a6a46ea553f471992364009147e81e96cd33e99e4c8001b
font_02_sfnt_off00014879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14879 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f