Malicious PDF — malware analysis report

Static analysis result for SHA-256 9729a9d8ed1260db…

MALICIOUS

PDF

74.9 KB Created: 2020-12-29 19:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe5ce9e10b0dd7614099d6b79d86995f SHA-1: d4bf0aa6f76835747983cd30437631ccb37d3e83 SHA-256: 9729a9d8ed1260dbec6dcdeb7f7cdd16be8ab4e6b808f8a1301dd2fae9893078
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm designed to attract traffic. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=happy+popcorn+glass+burst+offline+games+for+android
    • https://cdn.sqhk.co/vuxesojogugu/gfpihUG/iphone_digital_ringtone_mp3_download_high_volume.pdf
    • https://dalagusixofu.weebly.com/uploads/1/3/4/8/134853238/46504bb2.pdf
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/peduwenojevakal.pdf
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5f88a685af248.pdf
    • https://cdn-cms.f-static.net/uploads/4452599/normal_5fb9b3953a188.pdf
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/sutafida.pdf
    • https://tadivibudup.weebly.com/uploads/1/3/4/8/134899420/reduzojujopo-natimixan-zanol-kopixaw.pdf
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/kabakulisulatuwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f817f040-d488-49e1-b574-377269cdc24d/nuwejoliva.pdf
    • https://uploads.strikinglycdn.com/files/82752b07-cb12-4042-a0ba-c85471132e4e/fisopolapefuguxonemato.pdf
    • https://uploads.strikinglycdn.com/files/e858fa4e-be6c-4499-899a-c4bbcad7e595/survival_heroes_apk_mod.pdf
    • https://uploads.strikinglycdn.com/files/91014826-d7f6-464e-8dba-af82e2a3cdbd/cuento_cartucho_de_nellie_campobello.pdf
    • https://uploads.strikinglycdn.com/files/13fddbd8-c3d6-49cb-8fe0-b4abaaded379/54257543185.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93a.bin
c77edf03fcf195fa8b1d908763e80ff7d4123a13091aa79f241142135a42c3f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 5680 bytes
font_01_sfnt_off0000dc6f.bin
84daf345e21b08075a6e329eeacb0a13a0447ddcc3efc64e98a9a4ab9c6a9d9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 1936 bytes
font_02_sfnt_off0000e5af.bin
8f282ebc9bd28be300f088813f95dcaad16139184df5095c41b9d92b0fe8ba04
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 9804 bytes
font_03_sfnt_off00010758.bin
1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 16544 bytes