Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9a7b092af08345…

MALICIOUS

PDF

52.5 KB Created: 2020-11-05 15:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0c38c8701389f5f94a4eb6d9aa1afe48 SHA-1: dff12555295b13a79269adff5c9c9943c9830cf0 SHA-256: bf9a7b092af083459378ec65ef0a27caa7485cd6debdc93b0016e68642368da1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. 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 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://traffnew.ru/aws?keyword=blue+slaad+d+d PDF link annotation
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/9729591.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/kalosozaxogefik-moririjonaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5fa272dbee317.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/niditaxupusorulos.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/456beb1a13ea7.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/tikuwofudigugave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f870c599d8fa.pdfIn PDF document text
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/sekavivoxewo-muvesoveso.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/c5b0a714-8773-449c-947b-ef188408da19/tepige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077cec3f-e14d-412c-8602-f05f6d60ad87/meliretaxusofipamefidijis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebdcf4cf-4704-4ceb-9988-99282b492711/lijiborokiriko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eef41f9-c03b-4a91-90b1-2c9892dd7552/watch_my_hero_academia_heroes_rising_cam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf010971-d352-450b-b755-a96fd8db9ebc/97198834191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2749edae-0805-4716-91d9-01181ca98cf7/download_prime_video_apk_for_android_tv.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_off0000912b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x912B 4772 bytes
SHA-256: 67c75c2406a13ec705516a3ab2edfdf72a7422b3266b0159c0e4482ad8021d8f
font_01_sfnt_off0000a173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA173 10648 bytes
SHA-256: c6a3fa2872b19b968758653f7f26345a88cb98f6038b93295174308ccbf04008

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