Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b1490fa7d20086…

MALICIOUS

PDF

85.0 KB Created: 2021-04-23 14:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 09460a2297c11eedea4e3d37144318c8 SHA-1: cd8f0720282a704732abeaedba731ea67c24971a SHA-256: c8b1490fa7d20086d7aee35f545154e211ffca215a2f30a5d6207b62e15e0e2c
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-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.
  • 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://midufefew.ru/strik?utm_term=acer+laptop+black+friday+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366375/normal_6045eb35d28ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493890/normal_5fe7cf563158f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_605197aec48ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_605dca30628d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_5fdb674565f7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366958/normal_600365941cdf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495392/normal_60012ac9cc44f.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/gizonukorad/23672685319.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/minepikofofojafomo.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/vuxuvimulijuxujupidufimob.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/86992788250.pdfIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_10bf322bea784551878e5c8fb5d9c59c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/centre_pivot_irrigation_system.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_bcc52544c989499d9be5c6c05059d46b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/motor_oil_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/best_halligan_bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779fdeb9-c6a8-4d62-affd-3e7ddc01fed4/cat_416_backhoe_operator_manual.pdfIn PDF document text
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_6cafb747ef2b47ac8ca327365b7ae63d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/eerie_netflix_parents_guide.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_6c8842e96d714d09b6748e4cb7795fb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a138e8-219f-482b-9bbe-2fd7da2bfbe0/absence_de_quorum_assemble_gnrale_association.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0924cb97-aae0-418e-935c-1bbe94223e86/alita_battle_angel_anime_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/toro_gas_trimmer_attachments.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_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 5468 bytes
SHA-256: 4c6234fa0af30e437dee88c59f9691da87018fe05e7f9e6c78c0c021519fe785
font_01_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 11480 bytes
SHA-256: b9ba0672afb79c00efa63509a0eb89dbd2aa271c23745f86235f6124af1c9c6e

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