Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3db60b5fd004c1…

MALICIOUS

PDF

81.3 KB Created: 2021-05-18 01:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9471af4474f2a2e2cd694831a297181b SHA-1: 5c84e2a7c72f0dfff1268a218d8620b30175cf73 SHA-256: 3a3db60b5fd004c1668e0dada45f484ca83ad2cc774f1a070ef5fedd9f85d052
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to S3 buckets and other domains, which is characteristic of a link farm designed to distribute malicious content or phish users. One critical heuristic specifically flagged this as a 'PDF_SEO_LINK_FARM'. The embedded URL 'https://xezojetit.ru/strik?utm_term=...' is likely a primary distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://veregatuvodomos.weebly.com/uploads/1/3/3/9/133997599/xilenudunem.pdf
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/mavuzolofuni_wefer.pdf
    • https://vuvofazomegudej.weebly.com/uploads/1/3/4/3/134329778/401b7740fad35b5.pdf
    • https://didiseripipake.weebly.com/uploads/1/3/4/3/134344006/rezebiwu.pdf
    • https://wipegozi.weebly.com/uploads/1/3/0/9/130969535/3193741.pdf
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/wajavira_juguvud.pdf
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/ee33afb.pdf
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/fufoxopufop.pdf
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/guputubojitok.pdf
    • https://xezojetit.ru/strik?utm_term=%25D0%25BA%25D0%25BE%25D0%25BD%25D1%2582%25D1%2583%25D1%2580%25D0%25BD%25D0%25B0%25D1%258F+%25D0%25BA%25D0%25B0%25D1%2580%25D1%2582%25D0%25B0+8+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D0%25BF%25D0%25BE+%25D0%25B3%25D0%25B5%25D0%25BE%25D0%25B3%25D1%2580%25D0%25B0%25D1%2584%25D0%25B8%25D0%25B8+%25D0%25B3%25D0%25B5%25D0%25BE%25D0%25B3%25D1%2580%25D0%25B0%25D1%2584%25D0%25B8%25D1%2587%25D0%25B5%25D1%2581%25D0%25BA%25D0%25BE%25D0%25B5+%25D0%25BF%25D0%25BE%25D0%25BB%25D0%25BE%25D0%25B6%25D0%25B5%25D0%25BD%25D0%25B8%25D0%25B5+%25D1%2580%25D0%25BE%25D1%2581%25D1%2581%25D0%25B8%25D0%25B8
    • https://xezojetit.ru/strik?utm_term=%25D0%25BA%25D0%25BE%25D0%25BD%25D1%2582%25D1%2583%25D1%2580%25D0%25BD%25D0%25B0%25D1%258F+%25D0%25BA%25D0%25B0%25D1%2580%25D1%2582%25D0%25B0+8+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D0%25BF%25D0%25BE+%25D0%25B3%25D0%25B5%25D0%25BE%25D0%25B3%25D1%2580%25D0%25B0%25D1%2584%25D0%25B8%25D0%25B8+%25D0%25B3%25D0%25B5%25D0%25BE%25D0%25B3%25D1%2580%25D0%25B0%25D1%2584%25D0%25B8%25D1%2587%25D0%25B5%25D1%2581%25D0%25BA%25D0%25BE%25D0%25B5+%25D0%25BF%25D0%
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juzewojavomofew/high_pointe_microwave_convection_oven_manual_ec942k9e.pdf
    • https://s3.amazonaws.com/nafamaragisek/aida64_extreme_full_version.pdf
    • https://s3.amazonaws.com/dafumuxitupav/ten_eyewitness_news_adelaide_reporters.pdf
    • https://s3.amazonaws.com/dogevazapiwediw/kumano_kodo_self_guided.pdf
    • https://s3.amazonaws.com/lunojol/xekinalisubesizewoze.pdf
    • https://s3.amazonaws.com/dinisemowoge/acdsee_free_full_version_windows_10.pdf
    • https://s3.amazonaws.com/sesijesule/ac_web_ultimate_repack_free.pdf
    • http://jugikan.epizy.com/are_payroll_taxes_going_up_in_2021.pdf
    • http://kudadurazeze.rf.gd/sharp_r930ak_carousel_countertop_convection__microwave_oven.pdf
    • https://s3.amazonaws.com/xirixepo/adavilo_anna_movie_naa_songs.pdf
    • https://s3.amazonaws.com/timeziso/conair_1875_watt_cord_keeper_hair_dryer_aqua.pdf
    • https://s3.amazonaws.com/dazuxujepov/arya_1_malayalam_movie_songs.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_off0000e9e6.bin
9c6e2be8fc10cd3b1f4a7a01b0f2a503e90050631c6258d8a9d38966ab037cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 6132 bytes
font_01_sfnt_off0000fe51.bin
c87139f0f0be5e5ef7d5201cac0192b2c46965090fe7da8431520a6e5106bb11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 17088 bytes

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