Malicious PDF — malware analysis report

Static analysis result for SHA-256 557dc937bd194fb3…

MALICIOUS

PDF

200.9 KB Created: 2021-03-18 04:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 73a55c813d28ad9da43cb8868834e234 SHA-1: dcb52c4f9db2fcc78eb442b11e5fc3cfd310b454 SHA-256: 557dc937bd194fb32039e4f472d052a60ffd863bc160ff8784d6ae9b25854cb1
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a further malicious payload disguised as a diet PDF. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ponafet.ru/award?keyword=irritable+bowel+diet+pdf PDF link annotation
    • http://dk-inc.xyz/wisusavutoryhxum.pdfIn PDF document text
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/kefozewevawowivixev.pdfIn PDF document text
    • http://vir-tus.com/why_is_my_dyson_pulsating41zvi.pdfIn PDF document text
    • http://solapp.xyz/reterorejixumakupap64i25.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/2be4425186ac.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/3Zhgc4S/school_app_for_parents_login.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/fjjIDic/44546488298.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/gUidjcV/85552057376.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/j6XYy5S/43314481895.pdfIn PDF document text
    • http://katalog-siberian-force.online/goxarenutaretekululozok9ogpo.pdfIn PDF document text
    • https://xoxatujetila.weebly.com/uploads/1/3/0/7/130775098/4909243.pdfIn PDF document text
    • http://allerlo.xyz/safety_not_guaranteed_ad_quoteqpejv.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/bigirujedizexu_gugamope_dijatileg.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/iiVyjgy/23033698507.pdfIn PDF document text
    • http://francobusiness.com/37163353263c5cpg.pdfIn PDF document text
    • http://abzac.me/36451903006nrwkl.pdfIn PDF document text
    • https://cdn.sqhk.co/buwisotubu/Ejb3ijJ/word_search_2020_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/tezejikibus/hghche6/12844520486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3192d6ef-9d19-4463-abf3-9412cce4c947/pioneer_vsx-819h_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531b7295-23ff-4f43-87d0-7df54bb423d7/twyla_tharp_the_creative_habit_summary.pdfIn PDF document text
    • https://medlineplus.gov/irritablebowelsyndrome.htmlIn 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_off0002bfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BFA4 5028 bytes
SHA-256: f6ad4c8979d109b85d2502c0d7f8df296763ba662371fce4c5970285cc141231
font_01_sfnt_off0002d0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D0D9 15888 bytes
SHA-256: c4bb9b135121b686134b830205809634b5ab1282959b49dab53ff8b1a142299f
font_02_sfnt_off0003008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3008C 16148 bytes
SHA-256: 49436f94d5abf10ca6af8af9848174aab82dfe7bc58a5146411d238fd5c76648

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