Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0ddd123faca286…

MALICIOUS

PDF

85.7 KB Created: 2020-11-25 00:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6b2e543b05f90a635c36672bab5a7a25 SHA-1: d4960aca7ebaa87b7904cabadb1e19b9dc9128ee SHA-256: bb0ddd123faca286a49dc0317f2d91edfe3e42b1aba7535d504436a19ea71624
252 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=minority+report+2002++480p In PDF document text
    • https://fuxomiluzixoxam.weebly.com/uploads/1/3/4/5/134594746/ebf26b.pdfIn PDF document text
    • https://dililoperajat.weebly.com/uploads/1/3/4/6/134631443/sugeruwinetitu-tajipixulegesud-feropiwuw.pdfIn PDF document text
    • https://wububored.weebly.com/uploads/1/3/4/0/134042895/vituwurunoromi.pdfIn PDF document text
    • https://jewiwepetaj.weebly.com/uploads/1/3/4/7/134752938/zokuze-kopax.pdfIn PDF document text
    • https://fedobakeruja.weebly.com/uploads/1/3/4/3/134367732/266992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5f97cc3964a6e.pdfIn PDF document text
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/b8d4526be21d055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://s3.amazonaws.com/midipes/xikanuwufafikax.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/casio_hr100tm_adding_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/93436383256.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 5056 bytes
SHA-256: 105fd51474ce5507318534f40c508556fccc52cea91d7d5940f12eca0b634f12
font_02_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 20968 bytes
SHA-256: 699a8b55e50cd80192193eb3832e3199d82edd581ff2a4f3bd3563cc6d5fef53
font_03_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 2276 bytes
SHA-256: 0069fcdfb0d15a278d6261ba79e3a8ab1431e421449c0929a49ce00e9e70677c
font_04_sfnt_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 11172 bytes
SHA-256: b4401a7486c44cb465eb344fca2a4e73c978f8425f59a525876d2bb9fb7e83f6
font_05_sfnt_off00013fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAC 2056 bytes
SHA-256: 7be423a9975dd74696fa28cd46b52a55c3739f4a885228df3b07ea410fd2731b