Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fab2a3440ca39b…

MALICIOUS

PDF

121.4 KB Created: 2020-12-11 19:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 62f9505df328e77bb9c6ee1d71294939 SHA-1: b13e6c3aa3f367877271d4cfc0c4002df75392a6 SHA-256: a9fab2a3440ca39baca099ab71bd8956d5d99485d6281e5706faed6b109f7d84
184 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. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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/aws?utm_term=cavitron+sps+plus+service+manual In PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/2823216.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/jutupazufo-jopimibawe.pdfIn PDF document text
    • https://leniwexobopusez.weebly.com/uploads/1/3/4/7/134713406/tepoludozuzitazijiwu.pdfIn PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/nakofixoroz.pdfIn PDF document text
    • https://fesinukovib.weebly.com/uploads/1/3/4/7/134715349/88c43ce281.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/5390495.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://uploads.strikinglycdn.com/files/250f533a-79c4-4c55-8523-a7b45ed23a87/innova_3100_features.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57fc0bf-6a53-40f8-8b24-5a9f2a5826c5/98090121679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02834c07-ad45-41c0-8d5b-3ecec07e1e86/53513163427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f667379a-b105-4e08-9ba3-59263b601853/rolling_stone_oak_island_article.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b04b92-00ab-4f2f-879b-99a0dfc8812f/kojinilowogotuditagus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd8e4d3-394d-4cef-9f5d-5aebb59cb3d3/the_lady_with_the_little_dog.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc378dd6b97992eb56c2202/t/5fce97bdfbba055ca42d0e04/1607374789502/deer_hunter_vr_oculus_quest.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc293a78ef7301f8b1b7b85/t/5fd226ed8ba64b78df5eb496/1607608047738/rose_pink_piano_freiland.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc316acaffbf90a66f8b931/t/5fc518649d793648402ffc7b/1606752356452/lorotoguridewibebuten.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_off000190ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190CE 5044 bytes
SHA-256: bb2a715a8bf62574f1c475651345c196412fb32df36078364845575fa6f97f46
font_01_sfnt_off0001a1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1E4 11420 bytes
SHA-256: 086aa357db42d1549385cdffe98fef9cba755ee0f313bd005b908d54bdefbcfc
font_02_sfnt_off0001c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8C5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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