Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d33e99c5ba8f29…

MALICIOUS

PDF

84.1 KB Created: 2021-02-14 17:09:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 8a614a1be311555fca0e1bd946aba08a SHA-1: 400113c38b812c9ee4c42b36f3cb19f04933a446 SHA-256: 63d33e99c5ba8f292413fb4d3a8d43d6951e486886eec2ba8409c1e89634d439
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it hosts a link farm designed to redirect users to potentially harmful websites. The presence of numerous external links, some pointing to known malicious redirectors, suggests an attempt to distribute malware or facilitate phishing. The file's structure and the embedded links strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/aws?utm_term=butler+bold+font In PDF document text
    • https://cdn.sqhk.co/numanazolov/hgDhenu/onedrive_for_business_sync_client_latest_version.pdfIn PDF document text
    • https://sinekamawo.weebly.com/uploads/1/3/0/7/130776883/konufu.pdfIn PDF document text
    • http://italysummer.fun/nafemesaxaxikuxitalabalanf9ntu.pdfIn PDF document text
    • http://storezone.info/key_highlights_of_interim_budget_2019j0fr6.pdfIn PDF document text
    • http://testvvd.xyz/wow_classic_clique_guidefn9xr.pdfIn PDF document text
    • http://webmastervlad.ru/jifujevqr2dm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_5fd13f095d116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fe84a2e8d0cb.pdfIn PDF document text
    • http://natgood.space/maniradefekegizukavobilog4qk6u.pdfIn PDF document text
    • https://cdn.sqhk.co/topefebi/is16ijR/84839374336.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/gZXge7v/crazy_games_kogama_adopt_me.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/20a0caed6044a7.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/gTji5jc/11672562644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467571/normal_5fce10714d019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 4700 bytes
SHA-256: 4254c6e9a5bc1e453ae03c91272207e05b60ce909a1aea46dc937b562b31f24f
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 22128 bytes
SHA-256: 95a37b8e8b587aad7d5dd2bc9b0c03691704ddf3cb17c8cb0c89b5cf8976fdc7

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