Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c156e449477c24…

MALICIOUS

PDF

93.8 KB Created: 2021-06-08 18:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a71a9ad7f56598ec515d9dbcb79cab SHA-1: 69c782c2cfe975bf8ef78d9b25db8fd89741ca18 SHA-256: 68c156e449477c243a8c05d32f21e2f3ddeefec0ca6dc055f1fd2f9eac7ed747
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified as malicious by ClamAV and a machine learning classifier. The document body, though heavily obfuscated, suggests a lure related to 'positive psychology', likely a pretext to encourage clicking the malicious link. No scripts were extracted, but the presence of an external URI and the overall detection profile strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://coretry.ru/pbw?utm_term=towards+flourishing+contextualising+positive+psychology+pdf
    • https://cdn-cms.f-static.net/uploads/4368504/normal_60292cf92c44a.pdf
    • https://cdn-cms.f-static.net/uploads/4474223/normal_60bd4aa184b1e.pdf
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fd7d37a3104d.pdf
    • https://cdn-cms.f-static.net/uploads/4476780/normal_5fd268feb9434.pdf
    • https://static.s123-cdn-static.com/uploads/4392864/normal_5ff5d4f282b2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jowukon.pbworks.com/f/how_to_set_alarm_on_armitron_wr165_ft.pdf
    • https://uploads.strikinglycdn.com/files/9814c688-a238-4164-a21f-494179877848/fizuxotulasutif.pdf
    • https://uploads.strikinglycdn.com/files/51d8e7c8-a63b-4649-895b-985bd2ee7de2/jijoviderikategomeguta.pdf
    • http://rujuboxu.pbworks.com/f/contiss_salary_structure.pdf
    • https://uploads.strikinglycdn.com/files/523e4f67-7279-407a-9712-4d43ad2ef880/soxup.pdf
    • https://uploads.strikinglycdn.com/files/bf870a89-21d2-46bf-8823-e194df1df19d/english_to_spanish_translation_free_application_download.pdf
    • https://uploads.strikinglycdn.com/files/3f1ca615-7714-4999-9ff9-4a1028f6e5a5/whirlpool_cabrio_washer_error_codes_lf.pdf
    • https://uploads.strikinglycdn.com/files/f408d629-9d11-4cde-b389-2e4ee3008033/burning_wheel_codex_review.pdf
    • https://uploads.strikinglycdn.com/files/a16df1cb-93d0-423e-99c8-c5b0319fe09d/sitam.pdf
    • https://uploads.strikinglycdn.com/files/79209b14-dcfd-4fb6-897a-9bbe22b113c6/atlas_copco_ga37_compressor_manual.pdf
    • https://uploads.strikinglycdn.com/files/53191ef9-47aa-402d-8ff0-e1f6e5e9278d/piwaf.pdf
    • http://lijegazoz.pbworks.com/f/abbyy_finereader_12_professional_activation_serial_number.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_off00012f5b.bin
7211f987f6101b804666d05b863f6399338a424a53b35fed28f805bbb160a9e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5B 5688 bytes
font_01_sfnt_off000142d5.bin
f7c2fc7249c07c6cc07b6971f32bb7b43133842217920148692ae1b00d7ff31d
pdf-font-stream PDF embedded font (sfnt) at offset 0x142D5 11524 bytes