Malicious PDF — malware analysis report

Static analysis result for SHA-256 c762a9cb18b47c23…

MALICIOUS

PDF

71.5 KB Created: 2021-02-16 04:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 57591c55e9ed87bc7c3307d8bc725057 SHA-1: b2571472a125b0222e984fe3dd4d95099a486d5d SHA-256: c762a9cb18b47c23db2ff272f3d7b70fc6ab5c4a94bd13ec70c0db76626fd9fd
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users. The primary redirector URL is 'https://baarspo.ru/123?utm_term=how+much+is+a+smith+corona+manual+typewriter+worth', which likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/123?utm_term=how+much+is+a+smith+corona+manual+typewriter+worth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402294/normal_6028771275eba.pdfIn PDF document text
    • https://xoburevedevubuv.weebly.com/uploads/1/3/1/3/131380480/tekiwolaluzed-sigugesilop-xizawegoraweb.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/tPeia3d/watch_more_amazing_videos_download_for_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451023/normal_60081675426b7.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/hcByVLV/18310804752.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/jbGo3z5/beach_seaweed_tracker.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/PjajaCj/utopia_season_2_2020.pdfIn PDF document text
    • https://wigazasadus.weebly.com/uploads/1/3/5/9/135974004/62f28.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/xujfgjn/snapple_iced_tea_lemonade.pdfIn PDF document text
    • https://cdn.sqhk.co/weralutofa/vsXhdhc/arma_tactics_apk_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_60120dc876345.pdfIn PDF document text
    • https://cdn.sqhk.co/rapavuse/RNZcpAR/wolatufotivozum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456998/normal_6002d6cc8c28e.pdfIn PDF document text
    • https://kufaxaza.weebly.com/uploads/1/3/2/6/132680799/lunomabozizine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_6014912ac5d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5fdc5a96a1bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_601840c8119fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 5328 bytes
SHA-256: 71854f7b0c5074a147be2dd09922bd98ad1974a0291b3ee3bd9cec7a3463828d
font_01_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 10940 bytes
SHA-256: 320f2b384e65b1bbb2fefd53d6e6c8329bd8d0fc68483a1bc53a79ea5137e6e9

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