Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad056e0825480ab2…

MALICIOUS

PDF

64.7 KB Created: 2020-11-26 22:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3fc7e2a6f9bd0ccb44425d9bd4b023a9 SHA-1: 342b04b96dba750c5926ce4ef83d454e995429e4 SHA-256: ad056e0825480ab23ee46fe60c228859e1c5ce383c7115dd0f93448729cadbeb
244 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting services, indicating a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malicious redirection intent.

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://traffmen.ru/123?utm_term=eagle+rock+branch+library+mo In PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/rilapodefile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_5fbeecf644a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_5fa492b706e1d.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/9927719.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/manibulusevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450506/normal_5fa4a2039f43e.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/jafabo.pdfIn PDF document text
    • https://mapawoxerefer.weebly.com/uploads/1/3/4/7/134703144/6672271.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/8118384.pdfIn PDF document text
    • https://luzofimufabo.weebly.com/uploads/1/3/4/5/134590143/4036546.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/sugaguxagu/hydrochloric_acid_sds.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/armasight_spark_core_rifle_mount.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/austenitic_stainless_steel_phase_transformation.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_off0000bebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBB 5300 bytes
SHA-256: 373695f2279d9dc9e09a5090dadd13681b71dfd9a1a1cbe47edfdfd3a209b489
font_01_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 11084 bytes
SHA-256: 70295850155946e8e6709d43439396c2935dcdfb6a62f5cd73688dbe6fb08162

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