Malicious PDF — malware analysis report

Static analysis result for SHA-256 684cf966a2c877f4…

MALICIOUS

PDF

133.7 KB Created: 2021-03-05 11:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aacc07b865d2e00657c452292a513e38 SHA-1: 7a0684556cc0a0a3494ae0856498f66e895cbee3 SHA-256: 684cf966a2c877f422ebb9487ce39ff4548be2cac76755082e1ce52d890eafde
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users searching for specific information. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a phishing or malware distribution vector.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=chemical+formula+of+palm+oil
    • http://jasazotinalol.mygamesonline.org/33574546784.pdf
    • https://mogimefiledewe.weebly.com/uploads/1/3/1/8/131857364/b7f187a22e888e.pdf
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/19fbcd7e3ac.pdf
    • http://ramuwesitavoz.mywebcommunity.org/why_cant_i_share_public_post_on_facebook.pdf
    • https://pobipumobixox.weebly.com/uploads/1/3/1/0/131070364/nolinerajagug.pdf
    • http://mitutepoka.medianewsonline.com/is_the_boy_in_the_striped_pyjamas_on_netflix_ireland.pdf
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/goxusojog-tavovep.pdf
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/tuzikizekabo.pdf
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/2854914.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_c197a4e54aaa4dab815c79b7268d94d5.pdf?index=true
    • https://s3.amazonaws.com/jesidofefe/char-broil_grill2go_x200_portable_gas_bbq_-_grey.pdf
    • https://s3.amazonaws.com/mexavofezoxi/78637393365.pdf
    • https://s3.amazonaws.com/punurum/polygons_angles_worksheet.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_f2cb7c53ce4049cfa3b47f56f473ef0a.pdf?index=true
    • https://s3.amazonaws.com/dowesitobuga/24123475597.pdf
    • http://kisalonokexiwi.atwebpages.com/luxpro_thermostat_unlock.pdf
    • https://s3.amazonaws.com/wetowuzuxit/losajalajodarexidowit.pdf
    • https://s3.amazonaws.com/teximikamukubo/whatsapp_2019_for_blackberry.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b970.bin
44d4420ea8791f2dbb739de7d9bbbc3e99b06882d8f26c7f2d464b01bc12f984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B970 4980 bytes
font_01_sfnt_off0001ca34.bin
2040ec51bd28ac12de29a93a2056a900c2a7b2b67c802606039eea526bd9d8c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA34 12276 bytes
font_02_sfnt_off0001f410.bin
49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F410 16148 bytes

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