Malicious PDF — malware analysis report

Static analysis result for SHA-256 db51002a1305a103…

MALICIOUS

PDF

82.9 KB Created: 2021-04-05 03:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 557c931b59b5c48f14ff1ba6dc1b3a38 SHA-1: 958977f3a4405bdcd6f423fa8f279009070f5c32 SHA-256: db51002a1305a10320592e96f881eba7aeb9a5689230162f5f42171fab515af9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://botokaw.ru/strik?utm_term=how+to+draw+a+toga+easy PDF link annotation
    • https://jalizirut.weebly.com/uploads/1/3/5/3/135308553/a684fb226.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/applied_economics_book_for_grade_11.pdfIn PDF document text
    • http://storergoods.site/42755128392mccnx.pdfIn PDF document text
    • http://boevoenlp.com/434629705390gi81.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/star_wars_novels_chronological_list.pdfIn PDF document text
    • http://mxbur.fun/cholestatic_jaundice_guideline6rhex.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/5aa8a3bc8.pdfIn PDF document text
    • https://nepexinis.weebly.com/uploads/1/3/1/4/131438592/6054070.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/java_programs_on_arrays_and_strings.pdfIn PDF document text
    • http://slmit.fun/suruwexusuguguwadufezngs9m.pdfIn PDF document text
    • https://lalevajapogos.weebly.com/uploads/1/3/0/8/130874146/c0bc6ef1ca.pdfIn PDF document text
    • https://mofizuzu.weebly.com/uploads/1/3/4/3/134316779/d75ed66a1ccd0.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/1134347.pdfIn PDF document text
    • http://mopewogubit.getenjoyment.net/vowepovomidil.pdfIn PDF document text
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/b90c4d029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/dd_books_5e_set.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/8716022067.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/are_sonic_toothbrushes_really_better.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/94335171186.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 4528 bytes
SHA-256: e52fa075f5bddd90f9bf8e0de5a1aee3fa85e786d6ce3bc63c7f5743f7213945
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 5116 bytes
SHA-256: 701ca67697b851af52d0eba66140a04cfeb082188c1d305e8b293e9863ff5127
font_02_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_03_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 10612 bytes
SHA-256: 9d61f3ed3a8245f51b18818c7416ccf4d0f74ef96ad1403f6d505a7feac4d5c0