Malicious PDF — malware analysis report

Static analysis result for SHA-256 77aa359ead49dfa5…

MALICIOUS

PDF

79.9 KB Created: 2021-03-19 03:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ae2f2258f884c172433da7b44b15d5 SHA-1: 120837dc48db10e9792ece8e165bd34b18194dac SHA-256: 77aa359ead49dfa5f40b42543753dec2c04e645849a648b11618c6db9e07efa0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a potentially malicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm structure strongly suggest an attempt to redirect users to malicious content or phishing sites.

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://jacksth.ru/strik?utm_term=champion+dual+fuel+inverter+generator+price
    • https://cdn-cms.f-static.net/uploads/4405641/normal_6011de6e6bcc3.pdf
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/bb1bf5.pdf
    • https://cdn-cms.f-static.net/uploads/4451225/normal_601c878c582a1.pdf
    • http://ledy66.net/15979469760ps6ox.pdf
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/manavavi.pdf
    • http://tugrull.com/how_to_program_a_chamberlain_universal_keypadnqsup.pdf
    • https://puwedogomep.weebly.com/uploads/1/3/1/3/131382223/fiboxixujuri-zabej.pdf
    • http://zesamoa.online/how_to_write_a_text_response_essay_year_12o9wdp.pdf
    • http://megantv.site/guided_reading_lesson_plans_for_chapter_books7lm92.pdf
    • http://reduslimitalia-official.website/7v7_soccer_tacticssjtsq.pdf
    • https://static.s123-cdn-static.com/uploads/4461481/normal_5fe16681339fb.pdf
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/kunafuxudeboninezez.pdf
    • https://vumusubivabup.weebly.com/uploads/1/3/4/4/134491869/pamawaxorof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_7fc6f71ea4ca4d52a56d8d83df19623c.pdf?index=true
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_325e1ace00a54b9aa605b6d11cab0fc0.pdf?index=true
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_d6bb0e39132a4fd8ad192fb817384a91.pdf?index=true
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_e7e4d000ce65419199f47d6aa59b562d.pdf?index=true
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_696dda503abf4d8eb3f04bbceab92942.pdf?index=true
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_9c0c3e3de40647df8c727dd38cd72ff0.pdf?index=true
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_bf57abe598c14197bc6284b32164c360.pdf?index=true
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_6f7886f98f5746b98abe2c538b89f0c1.pdf?index=true
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_f4581a95ab8d4a4b9d133d4af0dc7b74.pdf?index=true
    • 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_off0000f6cf.bin
f08118140297c0672e10c752fb197142d1cf1a7f3885fa5d0a8e5900b1add8dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 5356 bytes
font_01_sfnt_off000108e6.bin
0ba3996595219a3902a2e35d5a0a10ccecb8ca5d7861101b10d44d1cc6935dd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 12028 bytes

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