Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cd44e453a4bb3f…

MALICIOUS

PDF

80.7 KB Created: 2021-03-29 08:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f6923883e7cbc82fd2cda13a71f49f87 SHA-1: a5c2a491144902a0fad58f1e49a12602dde3f8f2 SHA-256: c2cd44e453a4bb3f76dc6ebb55411e01100ca36c48c1c3ee5b8ad66376a3b3cf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to a 'plant cell coloring worksheet key'. No scripts were extracted, but the presence of numerous external URLs suggests the primary function is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://pelibifir.ru/wix?keyword=plant+cell+coloring+worksheet+key PDF link annotation
    • https://cdn.sqhk.co/burajugi/9Hhgge6/gepubu.pdfIn PDF document text
    • http://zetumitufam.mywebcommunity.org/30350285293.pdfIn PDF document text
    • http://stebsmeh.space/mount_error115_operation_now_in_progress_rhel_7s2mhm.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/je6gehe/premiere_theatres_goldsboro_nc.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/mT2bhjt/field_hockey_coaching_clinics_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/wggGCgh/octopus_teacher_netflix_trailer.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/9285811644859wos.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/vocabulary_worksheets_3rd_grade.pdfIn PDF document text
    • http://tubesebove.medianewsonline.com/estudio_para_charango_chords.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/dopaboxa.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/frequency_adverbs_exercises_worksheet.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://dejivuxa.mygamesonline.org/85897220010.pdfIn PDF document text
    • http://delabozaxexiris.getenjoyment.net/9319958132.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/igN5bFK/tales_of_windspell_hack_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nizofikunatafu.atwebpages.com/brandt_daroff_exercises.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/7842827334.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_79e43a28026c4beb87153e2c1713f8fd.pdf?index=trueIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/d-link_dir-890l_ac3200_router.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_7d7fb693ffea493390aa79fe695d913c.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 5320 bytes
SHA-256: b06441c05afbbd05b2a6b34a78d76dd3a5c3614aefd4d5f1edef682ebcc0ab92
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 11660 bytes
SHA-256: c0aa29286298b0b4e4d6c532522dded52d103b483b9a77964266b16ecc16174b

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