Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6887281eeb9d967…

MALICIOUS

PDF

74.4 KB Created: 2021-04-08 00:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c9bd89769bf13259ca5b73168961e6f SHA-1: 23850ba758e0b52a946ee2d7bd17c6e4391164e1 SHA-256: a6887281eeb9d967fe1cdd66d374b2240540b842aa3021cc6a9d2b02c912089a
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to search engine optimization. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent, likely to direct users to malicious websites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=what+is+the+maximum+length+of+a+dryer+vent
    • https://xatoxelal.weebly.com/uploads/1/3/1/4/131482937/pedigurusopuvij.pdf
    • https://cdn.sqhk.co/jedelamodafa/dlhimdq/autotrader_used_cars.pdf
    • https://cdn.sqhk.co/riwifesineji/jnihjbr/camstudio_apk_for_android.pdf
    • https://cdn.sqhk.co/gavezexu/cYhc0id/vezafuxokuvu.pdf
    • https://cdn.sqhk.co/konafomaz/ijhegfx/bubble_tea_edmonton_open_now.pdf
    • https://cdn.sqhk.co/janogoxuke/VhbP8gj/kulogikoroxokufapon.pdf
    • https://cdn.sqhk.co/tofatuxurejo/jghgigm/zonavadexoremipixepililuv.pdf
    • https://cdn.sqhk.co/mopomotop/idgecih/ludogorets_fc_score.pdf
    • https://lolewifewo.weebly.com/uploads/1/3/4/7/134710585/1438505.pdf
    • https://cdn.sqhk.co/sunomedude/pYhhmgg/automatic_changing_wallpaper_windows_10.pdf
    • https://lijujizakivim.weebly.com/uploads/1/3/4/6/134634855/segom-nimubetu-danidavabiwo-naduwumikipado.pdf
    • https://pebetojakudasud.weebly.com/uploads/1/3/4/8/134879391/f102df.pdf
    • https://cdn.sqhk.co/vukixukafoga/hifiim7/form_templates_bootstrap_4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bofake/27240970385.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_a68e45b79f7d47bb96a91b81587d33cd.pdf?index=true
    • https://s3.amazonaws.com/wenobagupexekap/92230143999.pdf
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_64031c2ddd5547018dc3b8f9944b9ae8.pdf?index=true
    • https://s3.amazonaws.com/tevomenil/92156058515.pdf
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_4a437e133be24fb6abd996b4473787f6.pdf?index=true
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_458443c83d074911bcfd94a44e410625.pdf?index=true
    • https://s3.amazonaws.com/fedufiporara/bbmas_2019_performances_kelly_clarkson.pdf
    • https://s3.amazonaws.com/memobofilenabon/sunesutiv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e469.bin
06f1c09f73dd0c40c496401bf1e4df23fdf34eb2c23d456e609b1784c370a9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 5564 bytes
font_01_sfnt_off0000f745.bin
750a0f2db524c40fa6cb3e7c3ce39d2fad0f956bb86998fd57f52dbe37a0effc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10804 bytes

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