Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5eb2931c0e28b3…

MALICIOUS

PDF

76.0 KB Created: 2021-03-26 08:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 743fb9de65424fae848ac8942a895587 SHA-1: d0d28365f078ea6d2ec2bb1a554890e25d15ebe6 SHA-256: 7e5eb2931c0e28b36df4a95b903f638723d26f8739f902230f2db596642a4ace
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to download sites. The primary redirector URL is 'https://golowaki.ru/wix?keyword=diy+lipo+charger+power+supply', which is used in conjunction with lures suggesting free software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://golowaki.ru/wix?keyword=diy+lipo+charger+power+supply PDF link annotation
    • https://vapigoje.weebly.com/uploads/1/3/5/3/135391726/vetuvutiri.pdfIn PDF document text
    • https://xuwazoleludike.weebly.com/uploads/1/3/4/3/134325396/kutesesak_sunigitomonatu_jogumajitim.pdfIn PDF document text
    • http://ayazshabutdinov.club/porolwy1xw.pdfIn PDF document text
    • http://lokotahas.ru/16555925205tcngu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_600a0102d01f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474734/normal_6002e1ceb122e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_601dcf658a49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_603c50f2590ce.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/kikunojulejuj/google_chrome_full_setup_offline.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_d7ff5646cb8842f19756117ee1e42d2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/what_does_one_split_second_mean.pdfIn PDF document text
    • https://b2691e05-be35-46d2-a26d-08c503de0475.filesusr.com/ugd/b15c0b_955deec5012d4cb388fc475b9a0221d4.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_c35ed823df544628825d2c5c3d9c7241.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/mlb_postseason_format_2018.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_da1cf3c78f1c481890f50af88b9220f7.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_0963a93b162b4223925d2324041c7c2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/laboratory_requisition_form_template.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_f641a5e693a648c3ab08443156a05423.pdf?index=trueIn 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_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 5388 bytes
SHA-256: 3cf9711b6b141329c50e120d61ca481a1da7893732e54491097c10e048b89609
font_01_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 10820 bytes
SHA-256: 87c48580e06affdf946db5f9b55dcae21a7af674bb4f9fd5713d2c679975cf3f

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