Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b33230480726af…

MALICIOUS

PDF

88.9 KB Created: 2021-03-20 22:14:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13891f3eb066c0bca01c7623ba30251d SHA-1: 7c9613b9f68a43b403b5a4d6c36ec701980cce1b SHA-256: a4b33230480726af341864d396f8f851b4d956f7ba94908f823064a5e096f8d9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged for containing a large number of external links, indicative of a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a URL that appears to be part of a search result lure. The presence of numerous external PDF links, many of which are unknown or potentially malicious, strongly suggests this file is used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=vocalise+rachmaninoff+pdf+voice
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fce17cb51275.pdf
    • http://gravkamen.ru/zabepedoxatui9l6o.pdf
    • https://cdn-cms.f-static.net/uploads/4408851/normal_6028ed8c6755c.pdf
    • https://cdn.sqhk.co/zozusexub/hijichg/maxexipitalapanesukevesoj.pdf
    • https://cdn-cms.f-static.net/uploads/4487626/normal_60391b10cea93.pdf
    • https://jukamonasob.weebly.com/uploads/1/3/0/7/130740128/fegezeraji.pdf
    • http://winsl.space/98801428753w4r9n.pdf
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/8a31d363f1.pdf
    • https://cdn.sqhk.co/vulovosovem/gjhiiig/ledikifapukivexupa.pdf
    • https://static.s123-cdn-static.com/uploads/4477620/normal_600908903e5f1.pdf
    • https://meputaxuxiku.weebly.com/uploads/1/3/5/3/135304120/rajofar.pdf
    • http://fruitslope.online/what_if_pangea_still_existed_redditb5xbb.pdf
    • https://cdn-cms.f-static.net/uploads/4456143/normal_602883ca72100.pdf
    • http://keepmaxi.space/fuvopukebuxufafurozogumu2gecu.pdf
    • http://my-favshopd.online/mitologia_griega_para_nios_medusaiodlm.pdf
    • https://sezifiloxoxo.weebly.com/uploads/1/3/5/3/135348424/d96fe0e229997af.pdf
    • https://cdn-cms.f-static.net/uploads/4369930/normal_6012c5129f89d.pdf
    • https://cdn.sqhk.co/xojelumegasi/0Uzzgjg/55051084807.pdf
    • https://cdn-cms.f-static.net/uploads/4365553/normal_600ce7fc1b3dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_df503b1ece5042bc8c15198acf76ee2e.pdf?index=true
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_c9e4c7206ccb497eb748725459648576.pdf?index=true
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_8d225b3ad1f64ad1886b13a0341dd5aa.pdf?index=true
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_1c6e086d298848dd92954d715102d72a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd32.bin
c0949ed72c09c1520913352032efa936de5a18d4a93f3d270dcc7a92befddb42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 5420 bytes
font_01_sfnt_off00010f7e.bin
8130c40ce660f53620d20352ed1bdf83a529a5735324c8d2112ad8f454b1eced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 16100 bytes
font_02_sfnt_off00014121.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14121 16096 bytes

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