Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da725f85d8a600b…

MALICIOUS

PDF

68.5 KB Created: 2020-12-08 03:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7241a4a4f959be6aaab207d886958177 SHA-1: d0770f79b32c050fb153664cbd9285c21d3503ca SHA-256: 4da725f85d8a600bd6f2860bfa1dc09106039dbd775b2ed9db6fcc0a90635ce8
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 0.9997

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/123?utm_term=ftc+v+at%2526t+settlement PDF link annotation
    • https://sibikobibe.weebly.com/uploads/1/3/4/0/134040949/6263791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421787/normal_5fc9eb645dcbf.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/2b8be.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/famonirul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5f90f2bedc214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f8ceecfee266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_5fabb22873cb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc178a7ea4a794d56491e65/t/5fced0b51901dd4d2ec2933c/1607389366818/bombshell_trailer_legendado.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc292a4e5c7695ca9a65d9d/t/5fc9501197a6c26aa4d5889e/1607028754051/zirirowojukugi.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/dimensional_analysis_examples_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/14700633838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ed949a-a673-469c-bb3c-ebc843060df6/31037374248.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC539 3908 bytes
SHA-256: d6b326d86021b7a9d542f6da64ee199f3c7de8168c0c84e4d8a7d997116c1d3c
font_01_sfnt_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 11616 bytes
SHA-256: b05d6733d878062eac343934c099997eb892e7de2578118cacc6c755befa3c14
font_02_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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