Malicious PDF — malware analysis report

Static analysis result for SHA-256 a504c5ad485010c9…

MALICIOUS

PDF

82.2 KB Created: 2021-03-13 13:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a602f544545ffc2fecf906555e1230f SHA-1: 5f18fbfa863544cc27851d7f9357503bfe0e61c8 SHA-256: a504c5ad485010c9f082d2f4562f394a744fea95a9d6d60f5c3bddb7ebb3ee4a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The embedded content, though heavily obfuscated, suggests a lure related to 'marriage wishes pics'. The presence of multiple external URLs, including one pointing to a potentially malicious domain (golowaki.ru), indicates an attempt to redirect users to malicious or phishing content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

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=marriage+wishes+pics
    • https://static.s123-cdn-static.com/uploads/4416305/normal_5feed06a272af.pdf
    • https://cdn-cms.f-static.net/uploads/4415754/normal_6037f740e1812.pdf
    • http://lidlid.xyz/best_browser_apps_for_android_free52sum.pdf
    • http://idslim-italia.site/26684610727v1ia1.pdf
    • http://tvoy-ogorod.online/diary_of_a_wimpy_kid_movie_series_downloadqdcno.pdf
    • http://hookup673.site/breakthrough_plus_2_gratisyv9hw.pdf
    • https://static.s123-cdn-static.com/uploads/4446035/normal_6003ec9095a0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kawotexulozax/setool_box_usb_serial_driver.pdf
    • https://s3.amazonaws.com/rizezobabub/revopufogavo.pdf
    • https://uploads.strikinglycdn.com/files/60335005-fdee-4249-9705-146c8fcb323d/27502320053.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_156518b063cd404c9cc574d3516871e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/abbc2456-98fe-4c6b-b46b-21fd9cf7c860/what_is_composite_function.pdf
    • https://uploads.strikinglycdn.com/files/e5959bce-52c7-4f32-8ba1-2af2164b01d5/jiwazogi.pdf
    • https://s3.amazonaws.com/tidigudetefumof/landing_page_mobile_app_template.pdf
    • https://uploads.strikinglycdn.com/files/9cb31d25-e71b-4115-b908-c62ba4e73b97/apa_format_reaction_paper_example.pdf
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_82deb896a1484585afcd7d6b4c41ed8d.pdf?index=true
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_68688455574344318f29c35916ae01ed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ccaabb95-fc77-4671-9015-072660ac5e29/funusekavejurelizesisu.pdf
    • https://uploads.strikinglycdn.com/files/b838cdd7-6410-40e1-9d5c-538528faf2e1/87553882831.pdf
    • https://uploads.strikinglycdn.com/files/67210a88-9afa-466f-bf8a-845fcd34dd72/bose_sounddock_series_1_price_in_india.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_off0000fb63.bin
f4fbfe63fe08296db5285048e90646ceb73b70ddc49af90c4c52606581fd0cc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 4752 bytes
font_01_sfnt_off00010bac.bin
33355f6fb61f9440caec7e98074f85daee98d13dd0bffe7eb8bbbeb90b3ff46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 9952 bytes
font_02_sfnt_off00012d7d.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7D 4324 bytes

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