Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a139b0abcb5d287…

MALICIOUS

PDF

68.3 KB Created: 2021-03-31 01:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c24634a86fbaaa6df15b9a0e54212f5 SHA-1: ee4bb2d3e54281dc97899c8e158eb3e633cb7aa4 SHA-256: 9a139b0abcb5d287864dac455818883737a41218bedbc10d0f10b9ae6bfba33a
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an external URI pointing to a suspicious domain, which is likely part of a phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=mathematical+physics+h+k+dass+pdf+download
    • http://fetesitomer.mygamesonline.org/ripari.pdf
    • https://tarofojazen.weebly.com/uploads/1/3/4/2/134235484/4927307.pdf
    • http://zinefikitozozeg.sportsontheweb.net/fekilipawizotefi.pdf
    • http://jidogirikar.mygamesonline.org/julius_caesar_by_william_shakespeare_analysis.pdf
    • http://rumepado.mypressonline.com/does_ao_smith_make_american_water_heaters.pdf
    • https://tapajiwegunet.weebly.com/uploads/1/3/1/3/131380495/rudulidopus.pdf
    • https://nuxutesinof.weebly.com/uploads/1/3/1/4/131437012/896873.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/megulu/15814134786.pdf
    • https://s3.amazonaws.com/fedure/87865230125.pdf
    • https://uploads.strikinglycdn.com/files/615de640-3b46-4aaf-a9da-765c9edb823b/double_dapple_dachshund_breeding.pdf
    • https://s3.amazonaws.com/sinamozagemoger/whirlpool_washer_dryer_manual.pdf
    • https://uploads.strikinglycdn.com/files/786f3de9-7440-4744-905a-da542b520456/yamaha_dtxplorer_drum_trigger_module_battery.pdf
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_c99bfc4261a242dfa9febf462b52cd43.pdf?index=true
    • https://s3.amazonaws.com/jewizopukuni/galaxikixefen.pdf
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_04b91e8d88034fe08a784a7209931f51.pdf?index=true
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_a5329e5d20d240b59ba05569c44ae4d4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5809575e-543f-4c63-8544-66c3b22c681a/49356064469.pdf
    • http://jifisuxevizek.myartsonline.com/saduvonubomejofozanejizo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd88.bin
46487e38294b5942d2610e83b4263e3e857f43337d6683368eb669ccb0f9d5a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 5564 bytes
font_01_sfnt_off0000e077.bin
41baf456cd9a35ddddb05a17ccc9786819b6c3c8332dfd3e23f2d03265ad2bce
pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 10392 bytes