Malicious PDF — malware analysis report

Static analysis result for SHA-256 9845c37a6375bbc7…

MALICIOUS

PDF

73.1 KB Created: 2021-04-04 16:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5913d44ead7cdc89045f2b0d91f697ca SHA-1: 746a8d22e10f572ac43cbf24f4fad46e75b8f0c3 SHA-256: 9845c37a6375bbc7b495cc7d73c2f60fa09ee80b8c08036e3656dccb9af9f2ac
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to a suspicious domain, likely intended for phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to a common household issue to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=aquasource+kitchen+faucet+dripping PDF link annotation
    • https://titajava.weebly.com/uploads/1/3/4/0/134096001/napap-dedidi-sugufonukalaxa.pdfIn PDF document text
    • http://helper-badges.com/bopinosufikafivelowakz076f.pdfIn PDF document text
    • https://wufaxewixebel.weebly.com/uploads/1/3/5/3/135302410/61eaa2348270a5.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/jaregimakup.pdfIn PDF document text
    • http://4338bacchus.com/mojibufevupeu40c4.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/8c60a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_f56661606251498f9d9e389dd812d29a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da77dd05-5560-43be-adea-34c757945957/a_new_pair_of_glasses_ebook.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_debfeb5f67b948cdae5f281d00ccdd73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/que_es_un_genero_literario_narrativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f50944-b91a-4e95-a249-d37fff821428/72819711055.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/business_letterhead_format_example.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/degoku.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/gegejebemineginulebelin.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/line_6_spider_jam_75w_review.pdfIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_68306ddf76ab4fe5bc696444a855a603.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/shapes_worksheets_for_nursery.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/unreliable_sources_of_health_information_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf80242-98f5-4eec-80bb-0c6133afafbe/salebikip.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 5564 bytes
SHA-256: a237a4c4af6a830eb3db6e5444bd521c6d134d2a40cc4412e77e1cdc242c06ff
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10296 bytes
SHA-256: dd020ee3a6fff53184bdfc59efb239d95644ab10a1819e69f561fdbc37ff661a

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