Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a892e6a2246edb…

MALICIOUS

PDF

74.1 KB Created: 2020-12-22 13:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ad967bfb75d94efbac99868e9aadebf6 SHA-1: 9dd34c5b6fa0f39122fe83cef96f4873ea64a79b SHA-256: 78a892e6a2246edb71382b359f63874786f43e377ac9f27406b6cfd56dcf1bf5
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple critical heuristics, including a malicious redirector link and ML classification. The 'SE_CLICKFIX' heuristic indicates social engineering to trick the user into executing a command, likely to download a second-stage payload. The embedded URL points to known malicious infrastructure, supporting the phishing and potential malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://cctraff.ru/strik?utm_term=mediaf%253F+re+minecraft+mods+furniture In PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/8641167.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/d585eab8343c0.pdfIn PDF document text
    • https://ganubosi.weebly.com/uploads/1/3/4/5/134506756/1426994.pdfIn PDF document text
    • https://mizanupiw.weebly.com/uploads/1/3/4/2/134265802/kexapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470837/normal_5fd062560220a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/loranoduzuja/brunei_international_airport_flight_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ef4279-e349-401e-b19c-719d6ff4323f/27695126731.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc652a0085bf90c0e221d2d/t/5fd023e95efba8153b19b9a4/1607476203504/30392687256.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/61520524157.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d23543c5ee75bf283f82/t/5fccb40fd235d37878c259aa/1607250960043/ninjago_skull_dungeon_board_game.pdfIn PDF document text
    • https://s3.amazonaws.com/xebareto/vekusewotakufa.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/60881316400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5556468-9ab6-4743-9916-e96b25f082c5/on_tyranny_epub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd53b4d610986319753e28/t/5fde795f459323513bcdeddf/1608415584310/11756234579.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC121 5164 bytes
SHA-256: 9918650a1d966170713c855c8f1908004750caecbf96e497ab4a300fc22fc192
font_01_sfnt_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 10724 bytes
SHA-256: f62c60904005447d0bf54788906664bde233634c19b727f3c9bd592ba376b49d
font_02_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 16212 bytes
SHA-256: 697c2def67ca018959b441aeac194f5af81831b7356d9eba4b64b465986b1279
font_03_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3