Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bbe352b5100798…

MALICIOUS

PDF

76.1 KB Created: 2021-03-09 05:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 56ee7fd2ac9584f7b08448d9e1c0a32a SHA-1: dd453bf53b81e643afa46d9946f8b924b31afd60 SHA-256: c2bbe352b51007980e442c6e8f8beb63ca03b951facc45f65652700e97d7a777
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'nipisod.ru', suggests an attempt to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata suggesting it is masquerading as a study guide, a common lure for phishing or malware delivery.

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
  • 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://nipisod.ru/wix?keyword=pect+prek-4+module+2+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480595/normal_6012c3adb9da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_60305a9c5d327.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/IbwOjdK/49404494672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368494/normal_5fca888a764d1.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/ghhdih0/tin_can_knock_down_game.pdfIn PDF document text
    • http://bimelar.22web.org/installing_and_configuring_windows_10_exam_70-698.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/iieHicd/dr_lynn_kong_ventura.pdfIn PDF document text
    • http://jupowawixiz.iblogger.org/small_merge_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/ejajagh/xifenas.pdfIn PDF document text
    • https://cdn.sqhk.co/nedevupoj/hije3gc/19282660865.pdfIn PDF document text
    • http://natimivenekixu.22web.org/ego_21_in._manual-push_lawn_mower_lm2101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xabenigirujufoz.epizy.com/67439170635.pdfIn PDF document text
    • http://lojibovel.myartsonline.com/78458227805.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_ed5335b408dc4939816afde7537ce96a.pdf?index=trueIn PDF document text
    • http://nukivamo.myartsonline.com/lisogidokipomewalaros.pdfIn PDF document text
    • http://dominomufu.rf.gd/dante_inferno_sparknotes.pdfIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_a1ef757d9d81444bbe8e9eb41b0f2edb.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/sas_enterprise_guide_7.1_ctrlf_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68d537c-d159-454c-8690-90133ce29983/6363307995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16183e90-683e-49fb-bffe-8888881d424c/poved.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_27050728546944158d23ffc8700f4faf.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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 5600 bytes
SHA-256: d10fd1e85af37092809d13d1b3889bba7a690ef87f212cc0540466823bf5bd6e
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10956 bytes
SHA-256: 2c25e223a823c2d718141ed093eaaf7edb26036d3c5c0b1bce42bdc944340f51

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