Malicious PDF — malware analysis report

Static analysis result for SHA-256 6851d78aa5e677f0…

MALICIOUS

PDF

79.9 KB Created: 2021-03-21 03:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b1e9a95755f2471ceff6985e67ec48d SHA-1: a2631a1ed82256e3e4c507991d42f8d4b8f22016 SHA-256: 6851d78aa5e677f0ac908ef353dc6f9624c269df0ac0bbeb306e9ad7f1f186fb
156 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 point to other PDFs, suggesting a link farm or SEO abuse tactic. One of the primary external links, https://zajinet.ru/wix?keyword=sport+head+hockey+minijuegos, is suspicious and likely leads to malicious content or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/wix?keyword=sport+head+hockey+minijuegos
    • https://vizodejow.weebly.com/uploads/1/3/4/3/134356937/b7c8f9c7f8dcfed.pdf
    • https://cdn-cms.f-static.net/uploads/4487399/normal_6016073180d5c.pdf
    • https://rijijuxika.weebly.com/uploads/1/3/5/3/135346754/sefidabex_betutidekub_giselebigid.pdf
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5fee5137477ec.pdf
    • https://wujupeduluruwuv.weebly.com/uploads/1/3/5/3/135316277/xaxabamebizinu.pdf
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/7242249.pdf
    • https://cdn-cms.f-static.net/uploads/4422914/normal_6039821fbca28.pdf
    • https://cdn-cms.f-static.net/uploads/4464068/normal_601c863109eef.pdf
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/regevo_soporarapa.pdf
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/begonipotozo.pdf
    • http://daparewipubuzes.22web.org/62641709325.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/090d5f55-1998-48ef-ac51-aa389ef5423f/45221921648.pdf
    • https://uploads.strikinglycdn.com/files/dbe2e148-4ed7-4eb3-a063-1ba1b17c3ce9/fuwomibajevaba.pdf
    • https://uploads.strikinglycdn.com/files/21e5b29f-0aff-4d31-94fb-44c19c8eda64/81143000884.pdf
    • https://uploads.strikinglycdn.com/files/0660d911-f125-4a0a-9119-34dd8cfd0e52/nolumorovegu.pdf
    • https://uploads.strikinglycdn.com/files/1285b5ac-5ee2-4a11-86ce-18d035da6801/49434542578.pdf
    • https://uploads.strikinglycdn.com/files/105f5dc4-c4d0-4d7c-8538-fce5b3ad8260/1465647767.pdf
    • https://uploads.strikinglycdn.com/files/24570e5d-fb0a-41bd-98cf-d1ef10d96770/wixakizadudij.pdf
    • https://uploads.strikinglycdn.com/files/383779f8-36b3-413f-8e08-1b834dd2abbf/bufakugaluladafa.pdf
    • https://uploads.strikinglycdn.com/files/97238820-0389-47b9-8cf6-a372bd352c72/jelofuragimibi.pdf
    • http://kudetewususitup.rf.gd/game_karne_ke_liye_game_dikhaye.pdf
    • https://uploads.strikinglycdn.com/files/9297a60a-c74c-4091-ad65-7d44e6d2f7fc/the_last_song_movie_online_with_english_subtitles.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76f.bin
a57176794fb7a013e93cca151452ceab3ae41f145674f294752e3d0a0dd59424		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 3016 bytes
font_01_sfnt_off0000f22a.bin
0c1e490c026109a36dd1c4492387b405552c2e75919f9e133a71f864af38e1c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 5800 bytes
font_02_sfnt_off000105ce.bin
cc3a26912de5156b3c80efe6d060565e1c7e0481441b4798656aa26ed90edf5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 13128 bytes

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