Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6c61b32c09b1b4…

MALICIOUS

PDF

141.7 KB Created: 2021-02-20 16:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c387c0ed74a5e0a4514bcdc1a1b03968 SHA-1: 87c23a865b20e149c581d9e364d5ed7d49a35704 SHA-256: 3d6c61b32c09b1b40074cc5e871b20f2df6f3109fc47fd7352160e79153252c0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains references to a movie trailer, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=kung+fu+hustle+trailer+german PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fe8853a6efcd.pdfIn PDF document text
    • http://baugroup.info/peganafezonepadevakerimqmc8.pdfIn PDF document text
    • http://italy-small.space/the_secret_dare_to_dream_soundtrack_waiting_lyrics4psc0.pdfIn PDF document text
    • http://probnik1313.tech/cid_film_all_songmwyrv.pdfIn PDF document text
    • http://tryplafond.xyz/equivalent_circuit_diagram_of_transformerok5n6.pdfIn PDF document text
    • http://umkatrade.ru/14475755325snhhv.pdfIn PDF document text
    • http://usacarins.com/sexixulatikesexifisusulm4zzi.pdfIn PDF document text
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/benukajoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5fe4427e275f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5ff76efcbb847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_5febcd1c04b5a.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/df7fd00.pdfIn PDF document text
    • http://haifaiv.ru/illinois_lottery_unclaimed_instant_p1y1zc.pdfIn PDF document text
    • http://7gusevshop.space/duzegotuwazedovofab0w6d.pdfIn PDF document text
    • http://daliadiago.com/35930668842rxm10.pdfIn PDF document text
    • http://cashbackk.site/679656416362kkpl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidasumibave.epizy.com/chromebook_linux_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16249 38744 bytes
SHA-256: cbaccad0e3f7af35788a3f1307b918db237a2ec2bdafc60b94783b203681255e
font_01_sfnt_off0001d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D993 5152 bytes
SHA-256: c9273801d366136f4b7f020148a65c801121fab48b58fd227d673364babfbedf
font_02_sfnt_off0001eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAFA 12808 bytes
SHA-256: 473321ce6bc3afe70baa9a3f83df8f65fa6793fd2ee4e2c44665d3ba67f6c2a2
font_03_sfnt_off0002143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2143C 16060 bytes
SHA-256: d26390a1b495fc4844790f49287189703365677ecb3af67b7cca25d146cf5ea9

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