Malicious PDF — malware analysis report

Static analysis result for SHA-256 21af9a281418e3e5…

MALICIOUS

PDF

59.0 KB Created: 2020-11-14 20:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4df27e2ac6999b4f610e31c600cf92ce SHA-1: a606d6bf2f605e3868a558c973a7cc409ba19bc9 SHA-256: 21af9a281418e3e566d8bbfb1283c7495e0480381d7501050616e1ba7d7cffe1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which are hosted on disposable or unknown platforms. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

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://traffnew.ru/123?utm_term=crystal+chess+set PDF link annotation
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/vigebonidonuju-puwabawu-ranepobexewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5f8e1a7695324.pdfIn PDF document text
    • https://nubitewubol.weebly.com/uploads/1/3/4/3/134385952/semozaku.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/115497.pdfIn PDF document text
    • https://fowimuwejagun.weebly.com/uploads/1/3/4/5/134529075/bakutonig.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/pasabijaxobevo-wulevotetig-xixuxit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa5c920-5196-41d2-90f7-8f9938a6b9a3/bapisewilurolawimavatedek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47012f76-d66a-4a01-bc6e-8c6241be763e/91357640719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3249dded-1c20-44b1-ac8d-5812bb4d42de/raxebajusov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa290fe1-5187-4713-b3bc-ed80934985e4/output_force_definition_in_science.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/26668546857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d631feb4-813a-4279-8bea-e83d3a040c2e/pulsar_digital_watch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b885198-20a0-4f30-9ab5-c2bcc7d2ebcf/58056564942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb7ffa4-3f59-4e49-a78a-9fe7fab22899/wells_fargo_near_me_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26023f22-5376-4ef2-aba6-a6cd8e5119c0/rerapesoruxizajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda32d72-28f5-4430-8fa9-2baa4d7c919b/pumowilefunidugibaril.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 4896 bytes
SHA-256: fcfca07a8738594536d1ec03d5ca1aa18e53297ba59b55b9e4743015564e6a81
font_01_sfnt_off0000c089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC089 8972 bytes
SHA-256: f0e4cb46b2a878c130e197ef4bc1f476d4b1ea730cf8df865c38595a416a6a9b

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