Malicious PDF — malware analysis report

Static analysis result for SHA-256 67dc88c2f07244dc…

MALICIOUS

PDF

82.0 KB Created: 2021-03-21 20:39:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e27effb1c6aca350aaadf693eb452474 SHA-1: ee64d358017278c871128df05b54d6c7f450b2ff SHA-256: 67dc88c2f07244dc3ff8fc6f0fce35e7b27386aa811e0fceedeb7855618aa076
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to unknown or potentially malicious domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to 'lecture ready 3 answer key chapter 6', which is likely a lure to attract users searching for educational materials. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent, likely to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://soxebez.ru/wix?keyword=lecture+ready+3+answer+key+chapter+6 PDF link annotation
    • http://teplotronic.ru/girlfriends_guide_to_divorce_cast_episode_18k00v.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/cjaiagf/anti_theft_alarm_for_motorcycle_philippines.pdfIn PDF document text
    • http://makedctl.site/eureka_enviro_steamer_pads_60675lpaum.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/25118335546.pdfIn PDF document text
    • http://getsol.xyz/video_games_to_play_while_high_redditxml6r.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/hhKjj30/fluid_wallpaper_iphone_xr_cute.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/wghpHzr/51618835203.pdfIn PDF document text
    • http://zuvixomajav.22web.org/maytag_neptune_dryer_model_mde5500ayw_manual.pdfIn PDF document text
    • http://roskycnmx.com/11121901101bz4jr.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/sebunuzu/urvashi_carnatic_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/todays_new_yorker_cartoon_explained.pdfIn PDF document text
    • http://solodiwamu.rf.gd/82268600102.pdfIn PDF document text
    • http://vepibali.rf.gd/71632227191.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/angiography_video_free.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_6a74e514977343ffa143b9ad0a0e8bfb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/abu_garcia_black_max_combo.pdfIn PDF document text
    • http://xegukamadoso.epizy.com/whitney_houston_star_spangled_banner_sheet_music.pdfIn PDF document text
    • http://poxelisenaxoxig.epizy.com/tedetasab.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/sixanitafufaxulazi.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_3f761e428fb348b0a51ac01964f5ed64.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_cdcf2cb232634694931966451a9cddd2.pdf?index=trueIn PDF document text
    • http://xoraruboxa.epizy.com/27745656968.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_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 5368 bytes
SHA-256: 81ee1ab5c18aa634b27c1fa7a8ac80379fe09b2308e629aaaa5017414bd27bd0
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 12916 bytes
SHA-256: 0acff09d6c94bdd0172ff5a9969822a998230019a7450e437bfba6b0eb190ce3
font_02_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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