Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a613672ec87cf9…

MALICIOUS

PDF

45.1 KB Created: 2020-11-08 14:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ffe7a21ba9b994509c0da5492a1f5cf0 SHA-1: d6ce274dd9cd4dd9ad1bcbfe37842c5f10d37733 SHA-256: 16a613672ec87cf972bfb8f16c0aec8fdec187710fbb475c622f2cefbf4e6781
86 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffe.ru/aws?keyword=tax+refund+estimator+2020+h+r+block PDF link annotation
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/vigajig.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/9015489.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/2220148.pdfIn PDF document text
    • https://niramividaro.weebly.com/uploads/1/3/4/5/134517418/ranujokugu-jisijudurofisax.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/debizikirapanas.pdfIn PDF document text
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/rulosoduravut.pdfIn PDF document text
    • https://futiwetag.weebly.com/uploads/1/3/4/3/134367494/5519429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/evaluating_algebraic_expression_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b60a634-c586-4a60-b889-a1c3cea19983/hedging_in_academic_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23d882b-f3e8-40a7-870a-ccfe5d3774ee/fidapisazewulo.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/fiserupevevaxakufix.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_off00006eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB1 5756 bytes
SHA-256: 6923f6c07e6dfa5e853e77040a8436f3996babe3d7de17079a90b5013cd83b46
font_01_sfnt_off0000821d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821D 11052 bytes
SHA-256: 1d2872034752cd7f323fb678a9df60d07fb87e79d41aff24dd6719a6f0466abe

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