Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2f05ebe9aab530…

MALICIOUS

PDF

71.6 KB Created: 2020-12-22 01:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 858539a45f7ebcebcc6f00fd5a645fa3 SHA-1: b0ed087d558525cfb181990b6326460865167beb SHA-256: ba2f05ebe9aab530d5e96272bcba63272390c34a0067d313b70346b34de435e6
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to disposable hosting and redirector infrastructure, indicative of a link farm designed to distribute malicious content or phish users. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly support this conclusion. Although no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?utm_term=hello+neighbor+act+2+ps4 In PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/vudevukuroju-galida-kipaxu-duduwakogafelor.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/6139256.pdfIn PDF document text
    • https://xoludifatak.weebly.com/uploads/1/3/4/4/134477652/zazabexafa-ditenojow-fegobexabatok.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/kojuvulewagefeje.pdfIn PDF document text
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/adec4.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/tavudifinixu.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/40ad5126bee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_5f9299c212109.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wanalovum/cdl_manual_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3f4af2-69a7-4b53-9e56-73eadae2647a/zafemeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928f4998-ceb1-407f-974f-3b4682a70e07/blast_it_2_space_shooter_construct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2073a622-8295-4d10-bfe3-8025e72158a5/mars_in_libra_man_mars_in_cancer_woman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9069eb-f1ad-4fb2-81f4-d352e70b07ee/risk_for_falls_nursing_diagnosis_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/ieee_829_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19273ffa-ccb4-4b71-8e5d-e172c61d993e/how_to_grow_wild_garlic_in_a_pot.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 5516 bytes
SHA-256: aea674bc6289ddff7d14650804dcb9abd29571cc1d238f049ec3859dd30ec21c
font_01_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 9620 bytes
SHA-256: 04d13e9ab168b8a680e7dadfaf2d4907c144be24a023f7a8cf3d98dc830854ce