Malicious PDF — malware analysis report

Static analysis result for SHA-256 af50d4b3f311446f…

MALICIOUS

PDF

76.8 KB Created: 2020-12-30 23:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5123ba061d5d5017f075f34e82005c79 SHA-1: c6e0c980d87fe6f4398282873e6aa420c14d4692 SHA-256: af50d4b3f311446fcc95d350698f6f5681ca9192e4dcfbff5cb709d91ab0595f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffine.ru/123?utm_term=wcf+vs+web+api+c%2523'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates a malicious intent to lure the user to a harmful site. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffine.ru/123?utm_term=wcf+vs+web+api+c%2523 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_5fc1c2f14439b.pdfIn PDF document text
    • https://cdn.sqhk.co/nalogigoke/g8Ngcif/sms_marketing_tools_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/gcM3VxI/radio_fm_transmitter_antenna.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/Aiagcid/32236856150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f87d3b772f74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496592/normal_5fc78c3089c99.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/3heggSy/jasakinogevidebu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fccd01824aa5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/sevoga/50659461569.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/joxoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0858546e-4e35-4345-9a2c-84196f167670/this_war_of_mine_the_little_ones_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2fb592-d590-4e2b-b3d1-74148e680d4c/wedakezivoladibanefo.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/vba_excel_date_format_cell.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 5188 bytes
SHA-256: 1408eba2a74f8b7ef823c27437820b89240a604d86480a9eb855faf0bda57292
font_01_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 6336 bytes
SHA-256: 2fc84a7ba4667e1f969eef468ab07c97a954a4b7f3f8f9b54273d5ca53b58085
font_02_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10536 bytes
SHA-256: b6316ed2f71fa45a9a1bd74b4775464f2761b082034bfa81626c732ae0ae272e

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