Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c8282aae05ad46…

MALICIOUS

PDF

93.6 KB Created: 2021-03-25 03:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25b4814c78a2a0d114342c92c85fc1c4 SHA-1: aeb0c671bce1cf1f5eff31f503b4034035f30601 SHA-256: 77c8282aae05ad46b89f67c270ddfcf75759b7f886b73b6b46823a9e56cb5557
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that appears to be a lure for downloading a game, which is a common social engineering tactic. The presence of a 'download button' heuristic further supports this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/123?utm_term=alien+shooter+3d+game++for+android
    • https://cdn.sqhk.co/gufezitaxato/jighgja/80786299888.pdf
    • http://pixelbarista.com/bikojibowanexetizepavovssoz.pdf
    • https://ripabefemedoge.weebly.com/uploads/1/3/4/3/134321398/robejawigojeron.pdf
    • http://ryursew.space/do_they_find_percy_jackson_in_the_lost_herogi2uz.pdf
    • http://panedapupugaxe.22web.org/91744279771.pdf
    • https://static.s123-cdn-static.com/uploads/4444096/normal_5ff5c2eb69b10.pdf
    • https://cdn-cms.f-static.net/uploads/4482413/normal_601e4f68a7deb.pdf
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fe7979b26cce.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_601716bf33f12.pdf
    • http://kojewotezigu.iblogger.org/scratch_3._0_guide.pdf
    • http://usechambre.xyz/vojanegozacf0dn.pdf
    • https://kiloroxo.weebly.com/uploads/1/3/0/8/130813762/6b1fa3ed66353a.pdf
    • http://goldstein.capital/how_to_tighten_a_chainsaw_chain_husqvarnamy7e0.pdf
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdf
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/571740.pdf
    • https://cdn.sqhk.co/gunonutib/7hEjfgi/35251675275.pdf
    • https://static.s123-cdn-static.com/uploads/4449183/normal_5ffc846a6e12f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fa14eb35-1038-493f-a183-3c09d3f3899c/8031081070.pdf
    • https://uploads.strikinglycdn.com/files/4022d73f-360f-48ed-91f3-816811088df7/what_is_an_example_of_a_keystone_species.pdf
    • http://wupewovixiroz.rf.gd/the_natural_cast.pdf
    • https://uploads.strikinglycdn.com/files/f14d8126-9526-4a6c-98a2-53c8260a2218/catalina_3-in-1_convertible_crib_instructions.pdf
    • http://meperaxatexuwib.epizy.com/93112041599.pdf
    • https://uploads.strikinglycdn.com/files/ddac64e3-c39d-4e57-bd07-8072cb219da4/87381614614.pdf
    • https://uploads.strikinglycdn.com/files/64c64c5e-c4bf-45f8-8ba9-393777aa9c98/salukikenovelepitore.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f79.bin
5f898291c6d299be523558d266350f049fd7c8f76491aa6a90e6b7d532c56a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 5264 bytes
font_01_sfnt_off0001312d.bin
043ac6ccd053a73c9ff439b55609a15163e1781d6521407efa4a98f4f7dd22f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1312D 12532 bytes
font_02_sfnt_off00015af5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF5 4324 bytes

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