Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e4534631635c20…

MALICIOUS

PDF

83.7 KB Created: 2021-03-13 21:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3f484872bc47ef315c81ed5056a02510 SHA-1: 9af338d37d8949df96250dbd5e9ce72a5e433968 SHA-256: 10e4534631635c20614be4ee14cee5d4df29b340a28793d857de2dd7d831f730
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://gimoguvi.ru/123?utm_term=ember+spirit+guide+7.+18 PDF link annotation
    • https://cdn.sqhk.co/kenipafitu/gfhgvl2/amazon_kindle_app_child_account.pdfIn PDF document text
    • https://xebuwonivaxatev.weebly.com/uploads/1/3/2/6/132696015/vikawujujif.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/wuwigazijir.pdfIn PDF document text
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/kabejofukife-dizaxasom-domagigid-gaxuroluzagiz.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/how_to_fix_lf_on_maytag_washer.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/Yiev5he/45076312898.pdfIn PDF document text
    • http://omshop.space/66046002379yh6a2.pdfIn PDF document text
    • http://sport-stavki.fun/nosilosuferozudofibigidpwcrv.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/jerusutusolipebipagule.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/nj_new_years_eve_2016z8mnk.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/60058970562.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/ia9Hagc/rajarituf.pdfIn PDF document text
    • http://7lessons.website/subordinate_conjunction_song5rsx6.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/MiibfuL/best_sad_ringtone_2019_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_6424c58d20a74e66ab43888c66a791b9.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_561bbae4ddb74ad8bfc2f17436765ec3.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_952202412efe4ce3990c349c3fbba5ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be984934-28ba-4a70-a782-9d51517c693a/does_allegiant_charge_to_change_flights.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_0ecc75ff7ab849749669bc3b93a8e85b.pdf?index=trueIn PDF document text
    • http://nununad.myartsonline.com/kexatugetaxizipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9fa1a8-ced8-4a22-aca6-e963b64eeb10/k-9_mail_android_apk.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_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 5492 bytes
SHA-256: 330337a204e4a6c3e5858103b741e211dc4ddb437298fb0086a58b5d87660674
font_01_sfnt_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 10476 bytes
SHA-256: e121c887b1b4757d1c215ac6a25a4f6f1afa96fd8d160662eff1957b2cf045fc

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