Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3e338ae1ebabe6…

MALICIOUS

PDF

83.4 KB Created: 2021-03-23 00:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e497a1e4ff9d00536b9e24a0c7024b59 SHA-1: 507ef60e341f381ae4fa01a315ab1582c8643137 SHA-256: dd3e338ae1ebabe644fc11d57845b87ab5ef879b731a2a9d75116c512487fb18
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious content. The primary malicious URL identified is https://xezojetit.ru/strik. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=are+the+walking+dead+comics+better+than+the+show
    • https://cdn.sqhk.co/xevowuto/ezbLamt/fireman_costume_toddler_diy.pdf
    • https://cdn.sqhk.co/livukigelo/jyjejf6/check_cashing_usa_miami_beach_fl.pdf
    • https://cdn.sqhk.co/zoluxoni/je8OKhd/51967825897.pdf
    • https://cdn.sqhk.co/vegupujed/aPFiepR/jovivivexamojulabimewov.pdf
    • https://cdn.sqhk.co/wedegetuso/gglYSpE/dividing_fractions_and_exponents_calculator.pdf
    • https://cdn.sqhk.co/bavimimo/ifhb6Jt/final_fantasy_games_order_to_play.pdf
    • https://cdn.sqhk.co/dogojaseziwo/ceidcp1/xokufezapuromunor.pdf
    • https://cdn.sqhk.co/zegofurop/jbVTsZ3/the_jumping_frog_of_calaveras_county_characters.pdf
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5fced2b760ad4.pdf
    • https://cdn-cms.f-static.net/uploads/4461250/normal_5fe7fc0bcbc46.pdf
    • https://cdn-cms.f-static.net/uploads/4382779/normal_600c5cff1519d.pdf
    • https://cdn.sqhk.co/sejukuxa/jgghMgi/tapabu.pdf
    • https://static.s123-cdn-static.com/uploads/4374703/normal_6007446e99177.pdf
    • https://cdn.sqhk.co/fujalapevame/alijCn2/gimuxipero.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_1b37d6a33ae94701b20e06b163d505a2.pdf?index=true
    • https://s3.amazonaws.com/wixanarer/access-_control-_allow-_origin_ionic_3_android.pdf
    • https://s3.amazonaws.com/jejulurowev/41128631810.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_f91f4dabae164c4497b9188822bbc514.pdf?index=true
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_0d830da32add4a379eda54beac79e7e0.pdf?index=true
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_d869123e3d5e4f4e940fe9f42e4e4b39.pdf?index=true
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_0cc5d33bfe2c4ba2bddeeb6271405a26.pdf?index=true
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_40a87adbf9f04bf3a72810b159229ccc.pdf?index=true
    • https://s3.amazonaws.com/medaliwifufugel/abrahaminte_santhathikal_film_free.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_off0000fa28.bin
d6d2e0c7237c3d8ca1ae8fdd3c116d91c83e4ed8c22c2e7f689e9735a0c3d962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 5428 bytes
font_01_sfnt_off00010c77.bin
eed18bc2691f4b6cb19b23fed26e620842dab359e63caee2313329543148b0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 10724 bytes
font_02_sfnt_off0001312b.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 4324 bytes

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