Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a334824380e8d6a…

MALICIOUS

PDF

66.4 KB Created: 2020-11-19 19:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a276877403105d40f223917f0d554f9c SHA-1: 5fe46d2089dc8b6c841714601ca5c9c940e7607b SHA-256: 9a334824380e8d6a02da75db33301c6dfb9d2d0ab6c627a893ccfa84f0b29950
222 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one link pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a script, and the ML classifier and ClamAV detection strongly indicate malicious intent. The primary goal seems to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=legally+blonde+musical+jr+script In PDF document text
    • https://noxutepobop.weebly.com/uploads/1/3/4/5/134510102/vibabik.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/5428394.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/danela.pdfIn PDF document text
    • https://buminezavo.weebly.com/uploads/1/3/4/6/134650892/xifuta-tivujo.pdfIn PDF document text
    • https://keziripar.weebly.com/uploads/1/3/4/5/134522929/abcb69871870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2545b8-59e8-4767-a5c7-2418312a046e/lutuxubomifabomozejis.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/r_kelly_stuck_in_the_closet_video.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/animal_jam_membership_code_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/romanos_hernandes_dias_lopes.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/don_t_stop_believin_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/54423646891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e26034-47b9-4d2b-a403-928b1859f139/32714966758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e292931-7a11-46dd-a5b7-3871cded3211/finally_rich_chief_keef_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 5652 bytes
SHA-256: 656bffc93131cc18db76e6c935098f27b8c9dc342c22b41413017d12d7bfae1b
font_01_sfnt_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 10172 bytes
SHA-256: 1e60cd657b4e94eba28d7b9c0a67aa19bc8dda19f6661e01f9d14ea01fad911d

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