Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48cbbb0199b1cb9…

MALICIOUS

PDF

99.5 KB Created: 2021-04-11 12:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b6f3f15ba75bece12ba56c1fe9326834 SHA-1: 91d6f31e748528b7a7d0f0f0e17a1ffa8b5172f0 SHA-256: f48cbbb0199b1cb924f4776af9743523d5b320aa24bf5d42181a952389cc2d76
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 0.9992

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://leonvi.ru/strik?utm_term=dewalt+cordless+circular+saw+18v+battery PDF link annotation
    • http://jatamonip.iblogger.org/fumugilinukezisefif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_603204e71fef7.pdfIn PDF document text
    • http://nigamenivikuki.iblogger.org/blount_county_alabama_police_reports.pdfIn PDF document text
    • http://didopikorubozav.iblogger.org/career_paths_electronics_teacher_s_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_6031ebf78feb3.pdfIn PDF document text
    • http://bolorura.iblogger.org/river_flows_in_you_piano_notes_abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5ffb4bc8cf9d9.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/wamatasamegu/lopifuzaxadirutipol.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/71111794492.pdfIn PDF document text
    • http://sumoguvovubipil.epizy.com/13837688091.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_995e8c935211443e8570f0d6cfc59d50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/examples_of_operating_system_and_their_functions.pdfIn PDF document text
    • http://fofuxolisemaxim.epizy.com/3878547822.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_4ebe02d64d48469cb3ad712ce38810ba.pdf?index=trueIn PDF document text
    • http://bigogekaziv.rf.gd/tebisozoretutoloxoletiba.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/dnd_5e_cleric_subclass_guide.pdfIn PDF document text
    • http://povalimokuwov.rf.gd/zanaxudafuvik.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_7842b6f69de7451db58b5307ce0705be.pdf?index=trueIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_314665f6254145f0966d47a32d7e4817.pdf?index=trueIn PDF document text
    • http://kefixofelapadi.epizy.com/92695588316.pdfIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_d1f83a40b2a94968a61c746a917591ea.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_b9b1485806914b00bac92a88d744949b.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_e78087c156234e6cac09154dc6491785.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/litunux/lukekawipofufapu.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_off0001463f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463F 5572 bytes
SHA-256: 50b7e7ba8f75e19b3f357752a86af6f0884fe3b3e4cc3e8ce1d12edc37a9f1e0
font_01_sfnt_off00015960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15960 11584 bytes
SHA-256: 157de282a37ec3d1ba3f526948c3328ba60353cdcbe8e6d2ae11c9a7ee04738b

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