Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7387160636b0c62…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 09:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bef981b73ecc5136c2d5d704d3f37b2a SHA-1: 97d0b8ed35647347ba4983bcb5c1b9e5606362ca SHA-256: f7387160636b0c62a802f1aa0d1d31dd418b93f74ba335c4f32889257f965481
126 Risk Score

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 0.9991

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://vilenefex.ru/strik?utm_term=what+is+the+plus+4+zip+code+for+my+address PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367273/normal_6021423656011.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/eijBhew/modern_sofa_set_design_wooden.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5ff121d073f40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445555/normal_5febc925a0da8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384652/normal_5fc9d20d91f67.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/gfhjRia/big_game_hunter_2005_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_604cefde1d737.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/fjgUWha/78029468709.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/ebgdsgh/33416624740.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/jdiduwC/5942187336.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenumizisil.rf.gd/1193250586.pdfIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_1d12e773e808456e99aff1fc6fc8a901.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8545ff4c-01fa-402b-898e-b403f85a8316/kevifigemezujiwase.pdfIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_13c09ce365dd467a9210d3a5f3a00f30.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_e1efb75b21594aceb1729347b4dfc011.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_cb85c3692c16451ea64ada8e4a896c25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b5a4bc8-2158-4269-a61b-e36f52840a51/world_politics_trend_and_transformation_2020.pdfIn PDF document text
    • http://kesotufujurox.rf.gd/autocad_2007_full_crack_google_drive.pdfIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_1dc60e0798ae4b078c612b53a0943205.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_2bb6830e00154227b697cb2b8e857313.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a457073-c8e9-477c-a1e3-f9ae8fbaad36/best_criminal_law_texts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79589d5-f75f-458c-8fc5-7431c2f7fca4/walgreens_cool_mist_humidifier_cleaning.pdfIn PDF document text
    • http://paluluw.epizy.com/how_to_use_haier_gas_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea72d32f-4ebe-4060-80f3-c2b6638e02cd/how_to_use_wps_button_on_vodafone_router.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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 5648 bytes
SHA-256: bd9b87f31894028f7df62d33d5ff3e9074c2e3d65fa134075959f948bd3ddd63
font_01_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 10796 bytes
SHA-256: 1e845736581e2d020e058c192411dbadab83b5f6863a9cbe531d433182a05005