Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3f843c7f11c052…

MALICIOUS

PDF

124.4 KB Created: 2020-11-30 22:55:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8af31c5d510d717b4ee66ceee0b4864d SHA-1: 1e15fb20fbb9f1e5213a0936bd17b2e3d9c4eb26 SHA-256: 7e3f843c7f11c05235ea9564aaaf8bf88a8ed4bbc911f97261b00751bfe60527
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://trafffe.ru/123?utm_term=bgsu+course+catalog+browse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379626/normal_5faf2b7454e3d.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/pugamukusog_jexube_fuwoxiginor_tufuzudokumuw.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/fd4799105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedimuta/em_g_c_d_chord_guitar_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c57dc37-7816-4223-b1ca-6e6012d21703/civ_root_word.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/maratidupavotowiful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51230592-af5b-40f4-a884-409517176a96/wupoduravexufibaxaji.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/99552639791.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/bonded_labour.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/61489273423.pdfIn PDF document text
    • https://s3.amazonaws.com/sanekufiwumafo/jonathan_taylor_thomas_today_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/batijurumi.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/60249619872.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/maxwell_house_haggadah_2017.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_off0001a978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A978 5248 bytes
SHA-256: 9bcf0e25c5fc361967cf5f77e893114442921bbcaadc6501798895589717d827
font_01_sfnt_off0001bb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB7A 12156 bytes
SHA-256: cf392492e505f47bc7d0a903bec8ada2208e8ae27d0bdad892376c35bf956939

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