Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ef67a43df71a52…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 07:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b54475867954452bc4d82571706b4412 SHA-1: 151ffe44328334a61c4f6e406f2fe4436fa1493c SHA-256: c8ef67a43df71a52c0b19a60f875abc7c2a7fe9a7f47c05153beab7750b6a11d
186 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 0.9997

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/wix?keyword=directing+the+documentary+pdf+free+download PDF link annotation
    • http://takotonefajale.22web.org/ccsuweb_exam_form_last_date.pdfIn PDF document text
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/e8d00b11d76ca72.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/which_exercise_is_best_for_lower_back_pain.pdfIn PDF document text
    • https://mabulibatelirip.weebly.com/uploads/1/3/4/5/134597637/jorilabosut.pdfIn PDF document text
    • https://bakedimilero.weebly.com/uploads/1/3/4/6/134609665/wutal-jigotezisame-dezexobixavug-viderevikasap.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/sewetipakadevosibumategi.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/c41220351.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/puguvidoz-venoj-zixabigajaz-nabexobo.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/9980168.pdfIn PDF document text
    • https://ruxevikupasej.weebly.com/uploads/1/3/4/6/134663562/varudaved_jaruraripi.pdfIn PDF document text
    • http://saridiz.22web.org/14114104902.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/3573b4bc-92c6-4289-9309-004ca8e04950/how_to_thaw_frozen_orange_juice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76eebafc-e6e2-40c0-9ca7-7a5adbee8a8d/disosetomuron.pdfIn PDF document text
    • http://rarujofa.epizy.com/wesewewul.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/anjali_bharti_video_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3b98c5-996e-4113-8be9-fbbcf320a51d/how_to_find_a_google_chromecast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f159f906-34b6-4771-a9f5-52b88e4ff8bf/hp_probook_6555b_factory_reset.pdfIn PDF document text
    • http://pumuvezanasen.rf.gd/book_report_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/pogibixipunejasozuzaded.pdfIn PDF document text
    • http://mukoluduxoge.rf.gd/medical_laboratory_technology_mcqs.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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 5584 bytes
SHA-256: 6e351c03741329d52946bb553439b6cc0a44a38c51655b82501a8533bed84b27
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 11000 bytes
SHA-256: eb4b5c1f1d5c65b20b9946b5fb8dfb816c2083b7531fbb93b31fe66a64bf689a

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