Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b373525839acfd0…

MALICIOUS

PDF

79.5 KB Created: 2021-03-01 02:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 48999ed5339033a8c4e4ba2620bff78e SHA-1: b022a77dcc8e43757b31560326ae1e8f65f28ba4 SHA-256: 8b373525839acfd062522c7cc372186eaf8de4ba96449dc8d4dd2667cbb54e9c
156 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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://botokaw.ru/aws?utm_term=2016+form+1040+line+44+instructions PDF link annotation
    • https://cdn.sqhk.co/tobijoge/hcgdhjs/azamara_cruises_japan_2021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_5fd16e3ba1ea5.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/aCjhifo/xukor.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/chdmYjg/22190223644.pdfIn PDF document text
    • https://popiliguji.weebly.com/uploads/1/3/4/2/134265512/730022f7a92.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/328hcS9/7digital_music_store_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/jhhidUj/54680267168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_603c35d84140a.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/kkjiRgd/25842828259.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/fjfhgjc/42183243635.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/Cgghjgh/five_nights_at_freddy_s_2_song_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/POaeid6/86912060912.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/ifhhViN/negalorunufutederu.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://s3.amazonaws.com/bulikowexunepov/vanojiwigade.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/social_media_marketing_trends_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/modinegegib.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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 5172 bytes
SHA-256: f32210eaaf5d7504a8f9f8463f1cb8278b1742a0d141e048a3cbcbf43be52627
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 10560 bytes
SHA-256: 4b2c61c9767c74ab8e49121f42ac7a95de165a92777049c44d3d977cd7735931
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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