Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fcd7d6d78aa4b6…

MALICIOUS

PDF

82.6 KB Created: 2021-04-05 17:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 63c0c9402971d4fb631009c4ca1c0577 SHA-1: 1770030cc6f9644cd858aa3e0bd4d2da00d5521b SHA-256: b5fcd7d6d78aa4b6fa363c9beb7320b46a74ae032d0f35f0adb2a7a00b47a5ec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=pharmacology+lecture+notes+ppt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402721/normal_6002b193e3cea.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/gjib0hb/90107849831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_603054cf84daa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499942/normal_5ffa43aad2c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391624/normal_5fdc03c705b37.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/dd_miniatures_monster_menagerie_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/LYjbjdN/d_day_beach_names_wiki.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/bloqueo_auriculoventricular_electrocardiograma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/378f3676-6ba3-453a-a5b0-b75c30b54362/ingersoll_rand_compressor_customer_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88596505-1697-4b14-947f-8aa225657783/how_to_program_a_hampton_bay_fan_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01777d1e-d3b5-4424-9204-61ac376c24df/valom.pdfIn PDF document text
    • http://jokosen.atwebpages.com/5638522036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc473c64-0f92-4b20-9aba-c1668a71ca39/94889732970.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_67ff5ee032454e91bf383d81d88b04b0.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_a2895d463b3e45b489fd6767045b52f7.pdf?index=trueIn PDF document text
    • http://golinab.rf.gd/avery_label_templates_5163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/864769fb-599b-45d8-96cc-e4892b9f1725/bililosebuviketodadige.pdfIn PDF document text
    • http://buvodadixasiz.epizy.com/powagizanawizoluj.pdfIn PDF document text
    • http://lafasusatar.rf.gd/flp_aloe_vera_gel_benefits.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_b149776f82e84a3cb1bc65f4093647c6.pdf?index=trueIn PDF document text
    • http://gozarenu.epizy.com/ipega_controller_iphone.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_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 5452 bytes
SHA-256: 2de2733c525d4ab6c203fd9c4d33ed98d071b6f854dd898f8221cf348d18731a
font_01_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 11672 bytes
SHA-256: 54b70bcfa60645220d25cdee7980e11a701ad8a7cf83464c9a040241a0053a0c

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