Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c82733b651d406…

MALICIOUS

PDF

85.2 KB Created: 2021-01-20 14:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cd4fd6d23e80780fdc6afd5446b72541 SHA-1: 4d7b7f9974932a3fb7420338d54b9e497395bf24 SHA-256: b2c82733b651d406eb8aa6cb64950dee36a691805717498bd5cec28d604a531c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it contains links to known malicious redirector infrastructure. The presence of numerous links on disposable hosting further supports a malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=rosca+de+tacos+corazon In PDF document text
    • https://site-1180367.mozfiles.com/files/1180367/body_of_evidence_hollywood_movie.pdfIn PDF document text
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/nifivapozotetiri.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/ad6e9484fcf1ce2.pdfIn PDF document text
    • http://manekobe.22web.org/tes_audiometri.pdfIn PDF document text
    • https://site-1166595.mozfiles.com/files/1166595/english_dictionary_app_free.pdfIn PDF document text
    • https://site-1177800.mozfiles.com/files/1177800/stickman_parkour_platform_2d_ninja_fun_races.pdfIn PDF document text
    • http://jelesanu.iblogger.org/ashoka_full_movie_hd.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/lubolapisiluronej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fb89bf33723f.pdfIn PDF document text
    • https://site-1175927.mozfiles.com/files/1175927/gadalubidi.pdfIn PDF document text
    • https://kabixiwuvilaz.weebly.com/uploads/1/3/2/6/132681231/zusilomigexevojetej.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/3416957.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/ba6f0e56.pdfIn PDF document text
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/1ded0.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/2cc73dd16292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowefaxi.epizy.com/advice_columnists_format.pdfIn PDF document text
    • http://suzurexitumafod.epizy.com/thiruvilayadal_aarambam_video_songs_isaimini.pdfIn PDF document text
    • http://xasonivuk.epizy.com/dorenapelij.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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 4960 bytes
SHA-256: 5857aad296fa252f8c3d0228d94543ceabe82df88ebee9052653217ff5ea80c6
font_01_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 6984 bytes
SHA-256: 2784e877af6d12a0ee09b609bcee11dc1923a89b90c3a2a7655e4fea6fb9f0cf
font_02_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 11968 bytes
SHA-256: 7bff9b2f5e10bf1c3feeae4f274ba4a06e9e07d5ceb7d8272b0fd49987cf7d55
font_03_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 18772 bytes
SHA-256: ac58b9dc14c862ce4bb0eb00b3c3f0915471ddf617e215f10903a0f9e93ab8ce

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