Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd84b5964804a9da…

MALICIOUS

PDF

78.7 KB Created: 2021-05-29 06:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 677a4bd517da14f47db1d5968330396b SHA-1: 7b943bbd8dce31de11fc32310d65b9a99505cbfb SHA-256: dd84b5964804a9da5acc74d4487099b9c94388df6d200dee05a5f70177da6cb4
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDFs hosted on various platforms, suggesting a link farm or SEO spamming operation. One of the primary URLs, 'https://bologen.ru/strik?utm_term=traffic+rider+hack+apk+mod+%2528unlimited+money%2529+1.61', is associated with potentially malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading files. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

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-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
  • 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://bologen.ru/strik?utm_term=traffic+rider+hack+apk+mod+%2528unlimited+money%2529+1.61
    • https://cdn-cms.f-static.net/uploads/4488133/normal_5fdbb18ade1e5.pdf
    • https://gaxizizobepebi.weebly.com/uploads/1/3/0/7/130740618/0778c719957f9.pdf
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/gafidisezita.pdf
    • https://zudomizat.weebly.com/uploads/1/3/5/3/135308615/wevele.pdf
    • https://cdn-cms.f-static.net/uploads/4446382/normal_600d18fa52b21.pdf
    • https://cdn-cms.f-static.net/uploads/4454040/normal_603ec0e6b41d8.pdf
    • https://voduzivesaduv.weebly.com/uploads/1/3/4/4/134456438/5595831.pdf
    • https://tepidopuk.weebly.com/uploads/1/3/4/6/134698813/1072069.pdf
    • https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/varigujovirekupej.pdf
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/934e3f1f35d2.pdf
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/188251c4cc9ce.pdf
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/0fbeed.pdf
    • https://cdn-cms.f-static.net/uploads/4452839/normal_603eadebe9cf4.pdf
    • https://tevomijirurefo.weebly.com/uploads/1/3/4/8/134846864/6841ff5e03a8d45.pdf
    • https://cdn-cms.f-static.net/uploads/4384460/normal_602d005f0adb1.pdf
    • https://kumapeforurimo.weebly.com/uploads/1/3/4/6/134664671/rotasazoni.pdf
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/mafamifowen.pdf
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5fe6a62a081f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/23dd783c-1577-4aa9-adbd-cacad1b2e200/how_to_use_parallel_space_for_game_guardian.pdf
    • https://uploads.strikinglycdn.com/files/008979a2-1262-4a63-b295-55ebefaabdf5/how_to_connect_canon_pixma_ts3322_printer_to_wifi.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_off0000f691.bin
9d611c235e208839be379e462638d2f28db12f8f08fb807391413ca1f12f0922
pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 5724 bytes
font_01_sfnt_off00010a02.bin
2db9926209f057489c73db038dfe091cc78b1b608a1c8e99591ee2a07c5ce0dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10344 bytes