Malicious PDF — malware analysis report

Static analysis result for SHA-256 b043b8b2b907e2ca…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 13:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3af8021023a38b89f78a64e6a31e887d SHA-1: 9ca72023b5acfad0e664ecdb01adf7bce08d2fe4 SHA-256: b043b8b2b907e2ca658398995920201777362b502212f402537bc23e3e429058
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The document body, though partially corrupted, contains keywords related to product resets, aligning with the 'SE_CALLBACK_LURE' heuristic suggesting a phishing or tech-support scam. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest an attempt to direct users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/wix?keyword=schlage+keypad+door+lock+reset
    • https://wotuvinuvokotar.weebly.com/uploads/1/3/5/3/135330473/rexotadeget-zusefedavufo.pdf
    • http://jusapp.club/what_is_the_secure_act_2020aflf8.pdf
    • https://zikavudosun.weebly.com/uploads/1/3/4/3/134329779/pisitilirodujizasuke.pdf
    • http://kungfumalibu.com/how_to_clear_cfa_level_1rt8r2.pdf
    • http://neyroskakalka.site/bilazuzonewa6ox0y.pdf
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/be0896cc8c1dacd.pdf
    • http://sayfelengs.space/halo_books_box_set84ayi.pdf
    • http://dom-bita.org/what_i_love_about_you_book_australiaflknj.pdf
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/6319708.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_e20230b09e7c4e3380a2425c51988d32.pdf?index=true
    • https://s3.amazonaws.com/xuxifuzituwu/zafasapokituvefe.pdf
    • https://uploads.strikinglycdn.com/files/6ff24cb4-b429-4461-8ad5-06afb2f803d7/star_trek_beyond_cast_ensign_syl.pdf
    • https://uploads.strikinglycdn.com/files/9e590beb-913b-4001-9e6f-7c40a3aa2aed/lincoln_mig_pak_140_specs.pdf
    • https://uploads.strikinglycdn.com/files/840eb965-7e8e-4781-b0f8-ec0a8f71d7ec/jafobezebafujosa.pdf
    • https://uploads.strikinglycdn.com/files/0392dc4c-0d2c-45a0-9295-952231202194/vefefolug.pdf
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_9546bbaf26bb4aacb985ed708325af48.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_19ece419322a4bc6ad32c574a853fe73.pdf?index=true
    • https://s3.amazonaws.com/ratixifo/borland_delphi_6.pdf
    • https://s3.amazonaws.com/rodiligarexo/jigijizemezoto.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_off0000ee4d.bin
7f757c2bc3d076b460dcd36ae5c820bd8e6b2c6ab52bcb9838bf2fa85cde28ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 5604 bytes
font_01_sfnt_off0001015d.bin
07f2baa609f7593c7cd7fa80433bf9fde285e36a3cb04f426014fe0ae4ccf495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 10296 bytes

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