Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd32f8fbef29280…

MALICIOUS

PDF

81.3 KB Created: 2021-06-09 07:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 667896b5dfcb5041b4478ca6131e3e54 SHA-1: f02e1c17ff241eecea2ea28f58120e6dc0685bfd SHA-256: 7bd32f8fbef2928057e26733dcbc0ddb7d59bae9cd4e0d175bceaea8096c33b7
222 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links and the malicious redirector suggest an attempt to direct users to harmful content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wb?keyword=what%20is%20omb%20circular%20a-11
    • https://cdn-cms.f-static.net/uploads/4472182/normal_5fe93ee7d83cc.pdf
    • https://cdn-cms.f-static.net/uploads/4425010/normal_60201f479ed8b.pdf
    • https://cdn-cms.f-static.net/uploads/4459941/normal_5fd8a8ad2aa09.pdf
    • https://ratisatemapabuz.weebly.com/uploads/1/3/1/3/131398591/6858521.pdf
    • https://balerezun.weebly.com/uploads/1/3/4/6/134665840/vaworasebujopeno.pdf
    • https://cdn-cms.f-static.net/uploads/4413987/normal_5fda734003ad7.pdf
    • https://cdn-cms.f-static.net/uploads/4378836/normal_6066d8f20ce01.pdf
    • https://cdn-cms.f-static.net/uploads/4448323/normal_605a6fca8e67c.pdf
    • https://static.s123-cdn-static.com/uploads/4384828/normal_6005440aa39a6.pdf
    • https://widawukilifuduz.weebly.com/uploads/1/3/5/3/135398171/wegemotiranofuz.pdf
    • https://cdn-cms.f-static.net/uploads/4387928/normal_60ba5eb7330e7.pdf
    • https://jovapotokuxeb.weebly.com/uploads/1/3/4/8/134881142/45529de00c804e.pdf
    • https://tozobaveje.weebly.com/uploads/1/3/7/5/137501006/383ad107.pdf
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/nawibovu-wapaxurodunopab-gafuruzifub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5b7efa48-160e-4517-a81b-ace59877897b/red_dead_redemption_2_hunting_guide_map_real_life.pdf
    • http://kufavuva.pbworks.com/f/51171075018.pdf
    • http://savavaze.pbworks.com/f/74451101539.pdf
    • https://uploads.strikinglycdn.com/files/80b380dd-2a4e-41de-adff-d71f7a57a961/how_do_i_get_a_voided_check_for_direct_deposit_chase.pdf
    • http://madatev.pbworks.com/f/luwipugujesamulixevoma.pdf
    • http://lugozamuxika.pbworks.com/w/file/fetch/144883281/binamijopogejilabusuva.pdf
    • https://uploads.strikinglycdn.com/files/f1e3dbb3-c5ac-4f58-b0d0-96caf7499282/yamaha_timberwolf_250_wont_move.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_off0000ea1b.bin
707f23e671a03a44c843a33e64b6974a4eb33dce90420e418665ea441a1ea472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 5276 bytes
font_01_sfnt_off0000fbf4.bin
6bd4198be1b33f7f9971854d4308bbf50d97336e162c203a495a68f4b6bfd29f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 10712 bytes
font_02_sfnt_off000120f3.bin
6ff35bbcdef839a823e086214e5d609f702bf6b4484614f6c4b824d32b7fcc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16204 bytes

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