Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fefaf5743f20251…

MALICIOUS

PDF

84.5 KB Created: 2021-01-15 04:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 11cc280882935ae69191dd49a59774de SHA-1: 7164c0e3cf68fa9d4026e85ea66420cdb704e628 SHA-256: 7fefaf5743f20251fa448c205184cadd97be73788198791fe48100ba0628d56c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection scheme to malicious sites. The document body is heavily obfuscated and contains what appears to be metadata rather than user-facing content, further supporting a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://traffset.ru/123?utm_term=bhaja+govindam+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5fb90b82c9e18.pdfIn PDF document text
    • https://site-1249389.mozfiles.com/files/1249389/samsung_software_update_tool_free.pdfIn PDF document text
    • https://wibabuxef.weebly.com/uploads/1/3/1/3/131380054/f453aee32365ff.pdfIn PDF document text
    • https://resojuwow.weebly.com/uploads/1/3/4/3/134351964/zavudub_vuzupa_badasumoti.pdfIn PDF document text
    • https://padorapa.weebly.com/uploads/1/3/4/4/134496521/xasinelen.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/f4gg3mH/25546833234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f9a09909d14e.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/bonobozu_fubusupo_vigasisoxonewis_vokepodeleni.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/gimopiwutuvejifejaramew.pdfIn PDF document text
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/puwurufaxudoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/tnrhffB/38578639695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5faf99f63f9d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410015/normal_5ffccb86118c0.pdfIn PDF document text
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/vitubolurepazikegu.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
    • http://fedorahosted.org/lohitIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 4888 bytes
SHA-256: 2123e82e63f937dc4ee2680c4e6f4da6e450b67669235d1797f0544f640ce13f
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 3772 bytes
SHA-256: e2c7bb3c6d2fbc6b9680c858ce58af9e5cd0e4fbc18f33bdd2ad1d5654d08a87
font_02_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 11684 bytes
SHA-256: 40ebb79cab3f88c7507cd10c1c649d47b77a8c8ee4d14c4de393623c75715e20
font_03_sfnt_off00011936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11936 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_04_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 8640 bytes
SHA-256: 967c8e81048781e4961dbe21d9a1246c6443bd4a737d19ac8129f3707c20d526