Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6f2d7e18a91cd9…

MALICIOUS

PDF

70.4 KB Created: 2020-12-09 05:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 427d9883cf8bce267b77457b0043f658 SHA-1: d0d269e3d6baf8aa1bf5ca66024d579e78339b80 SHA-256: 1e6f2d7e18a91cd95ee9e9a3dcf92e10fa8e3dcb20863f5d6f66192675793093
186 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 ClamAV and an ML classifier. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=how+to+solve+scale+drawings+and+models PDF link annotation
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/rutat.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/2861699.pdfIn PDF document text
    • https://lajezufil.weebly.com/uploads/1/3/4/6/134636359/7220171.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/disibub-nosibevile.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/1987640.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/fipolufifosex.pdfIn PDF document text
    • https://wexixumativedo.weebly.com/uploads/1/3/4/8/134865676/migatijuli.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/48a2b81c-1d17-40ae-bbfb-0e8742fe0cc0/mewus.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/11087738722.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/72468071413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/521c804e-fae0-4514-a1fc-8c787adb957d/vanevutuzizugupoxaxep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fde5c35-43f8-4621-ad10-75842afbbad8/70385371833.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_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 5372 bytes
SHA-256: 7f89644f8b4f8913ff4d6be0c48e00da04696e6b1d47a75ed225b5fcebe8b7aa
font_01_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 10408 bytes
SHA-256: fd2cf46cf03adbd022cd9af1b6e5cc2426becbd2ba321e048f49e5d7bf72409d

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