Malicious PDF — malware analysis report

Static analysis result for SHA-256 828b664be47426d6…

MALICIOUS

PDF

81.0 KB Created: 2021-06-06 03:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8598bc4e5b59cf6e6ed4c5758893e66d SHA-1: 515c4d73b4edbcedd81d6839650540faef759d9d SHA-256: 828b664be47426d6477339863e16efa9d99d715567fd3638f5713f55476a1d1c
116 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to make a phone call, a common tactic in tech-support scams and callback phishing. While no scripts were extracted, the presence of an external URI suggests a potential for further malicious activity or information gathering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/pbw?utm_term=where+can+i+get+a+twic+card+in+houma+louisiana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424013/normal_5fdc7eb99747f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fd2ad69eb9af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_602b5a99b1bd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385635/normal_5ff76d39b955d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451019/normal_6056926d6bebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469824/normal_60446c61a8037.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fef3be88f042.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413007/normal_60afee3151fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476302/normal_60b9e1a570926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5fe0194922470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6060b8480ac1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_603c662b32897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_605645c4c0f46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_606237ff15e77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kigiputilik.pbworks.com/w/file/fetch/144609681/31636330661.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/readers_digest_march_2020_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e06f96-d9c6-47d1-aef5-ac70d79f4689/fl_studio_20_mac_download_reddit.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144439632/974004817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ec7879-0f2e-481f-b658-e70e0109e0ab/kenmore_elite_smartheat_quiet_pak_9_dryer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d413c86f-b016-42e4-844e-cd0173aea252/bless_me_ultima_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 5460 bytes
SHA-256: 784332d11e9f27f631323fc077ae81eac473eca911efe520f6a483f7ac8421f8
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 11312 bytes
SHA-256: 3f9d5f2d47f2e75b855d5e02aa9d4ef3a8782248652cab270a539a8a30dacfbe
font_02_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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