Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef087e6005baa428…

MALICIOUS

PDF

74.3 KB Created: 2021-02-19 10:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5303d9bb4b2a9efa1179d74d87d2d19e SHA-1: b23b12eb9690b0c9fd8df48774d76f0c75f34c37 SHA-256: ef087e6005baa428d1692a9d7b6721670d65ac8104720e115925eda25a780111
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a primary redirector pointing to 'https://maypoin.ru/wix?keyword=dunbar+armored+jobs'. This URL, along with other embedded links to S3 buckets, suggests a phishing or malware distribution scheme. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics indicate the PDF is structured to appear in search results and redirect users to malicious sites. ClamAV detection and ML classification further confirm its malicious nature.

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://maypoin.ru/wix?keyword=dunbar+armored+jobs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476302/normal_600367c32cd16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_6029932a141ac.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/4085915.pdfIn PDF document text
    • http://select-get.top/how_to_treat_cat_wounds_naturallyqavtu.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/5689e66586cf431.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/vobavomedutodebopej.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/sanudaxa.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/wubugejiw.pdfIn PDF document text
    • https://dunebuka.weebly.com/uploads/1/3/2/6/132682868/zipun-gewibebaxuro-sabude-zopoxawemo.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/likadojivivofu/crystaldecisions._crystalreports._engine._dll_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/ronseal_yacht_varnish_satin_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/12656435868.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/kusofuzedarozilapitokupi.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/chatal_band_remix_naa_songs.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 5152 bytes
SHA-256: 6c8949b35452dcbd68b65c5889f32348367e89f6e3aa80266bdb1cf050da6b74
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 10748 bytes
SHA-256: c4133ae8c9bd121646e7b00fb700b225343419a84e32f3e2aa082d99ef1c87ec

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