Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c07fbe4d220a97f…

MALICIOUS

PDF

78.7 KB Created: 2021-03-15 23:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ef31cf767d31a712e18c0c2d58d23a3 SHA-1: 75b9e7d661dfa4fe42043dd631709e57f6f895db SHA-256: 1c07fbe4d220a97fd30f0e876e411bd7f25919ff35f856058736075b1e14c449
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or redirection mechanism. One of the primary URLs, 'https://golowaki.ru/wix?keyword=franchising+an+entrepreneur%2527s+guide+4th+ed+ebook', indicates a lure related to an ebook, likely to entice users to click through to malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest an attempt to redirect users to malicious websites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=franchising+an+entrepreneur%2527s+guide+4th+ed+ebook
    • https://wevopuvigamez.weebly.com/uploads/1/3/4/3/134320632/luperibaxurifin.pdf
    • https://cdn.sqhk.co/fegujajox/haHbRMe/28636215295.pdf
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/9926769.pdf
    • https://nizufamira.weebly.com/uploads/1/3/4/3/134310662/wuxerapasufiwu.pdf
    • https://cdn.sqhk.co/gavezexu/ThdjdJH/angry_birds_transformers_best_characters.pdf
    • https://migijulomav.weebly.com/uploads/1/3/5/3/135394851/1555013.pdf
    • https://cdn.sqhk.co/gevajoke/hj6hdYr/cedar_point_lighthouse_point_reservations.pdf
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/gonefugon.pdf
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/248fd5.pdf
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/8419982.pdf
    • https://cdn.sqhk.co/winanuwumovu/hhRY2xl/60483157047.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/271e3b06-271e-4b16-afb0-a47ad906426f/33038563411.pdf
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_37ea5da0384f4bc9a8cf0f16e6486548.pdf?index=true
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_e85c776d4d69450abf52860997c1e945.pdf?index=true
    • http://kimamewaseziwal.epizy.com/84788871823.pdf
    • http://xolemobubusosi.rf.gd/54512702520.pdf
    • https://uploads.strikinglycdn.com/files/ee884c8e-6640-4898-b6b0-ac416d181c16/69241597546.pdf
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_23755b08ded24c2fb401d3df9efaa274.pdf?index=true
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_508d9120cf5347079a496cd11c17f16e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f8037a81-8420-43c1-b298-2cc298508a76/ridinupo.pdf
    • 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_off0000dd4d.bin
8ba6d2ec5e4b2d224ad8fc15f47b79c4428e4edfaeac4229b5462bd94f4313ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 5584 bytes
font_01_sfnt_off0000f04e.bin
e208f335d635ecbfc079b31093c4b2bf20a50fe878670d0534040ce55e14d15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 11540 bytes
font_02_sfnt_off000117c8.bin
29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 16084 bytes

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