Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef1ff90d98d7653…

MALICIOUS

PDF

79.2 KB Created: 2021-05-12 13:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8396df19af15300e522173ac6db517c8 SHA-1: 9b0a59d38349298369b5603da79882ede6aa153a SHA-256: 1ef1ff90d98d765348df67fb5ba0b3fc05e0b4c489943c6b4f668e5db4ecb331
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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.
  • 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://jacksth.ru/strik?utm_term=the+book+of+secrets+full+movie PDF link annotation
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/9034115.pdfIn PDF document text
    • https://komovifewujip.weebly.com/uploads/1/3/4/8/134895136/7749644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fee2b62880ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_604b544cc66a7.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/kufageluz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_600decf14fb7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368949/normal_60021a5f7add6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_60185c184bf40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rerinago/kitutizeruzemijuj.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_17561004235d4d75b83c5c590b9af131.pdf?index=trueIn PDF document text
    • http://sowugipow.rf.gd/cristianismo_resumo.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/used_android_phones_unlocked.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/video_er_facebook_private.pdfIn PDF document text
    • http://bexufomadixin.rf.gd/safenameperusanofopimak.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/kufasedewiwemowu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/bombay_dyeing_double_bed_sheets_online.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/88949891291.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_825d0f44d22e46a98c7053613f384ca3.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_83d91dd822f54e788d59100f2bf67168.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/free_printable_blank_comic_strip_template.pdfIn PDF document text
    • http://genosumexeser.epizy.com/redutimugu.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/gufunubolesesudatader.pdfIn PDF document text
    • http://juvogexef.rf.gd/wuferuvorexabupid.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/43152821138.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/taxuwote.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/college_chemistry_experiments.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_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 5124 bytes
SHA-256: 7b67f31c29d7fc8735ce3450b6a6fc5abae103a819922ef1be1bc420b5d79a6c
font_01_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 10768 bytes
SHA-256: b986553e32a1196d6d8eed08d8d5048242d88dad72a5253e5c31c709c5ef6f32

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