Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12465af61dd7bc1…

MALICIOUS

PDF

91.1 KB Created: 2021-03-29 10:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e56105557237d2b4f487c9025f8f496f SHA-1: ef577971cce779fb185f158552dc6e5733440ed7 SHA-256: c12465af61dd7bc10a0d7842701ae8ab6fbe0690414e000f3d3840daae969bbd
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 0.9994

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://vilenefex.ru/award?keyword=aborder+une+fille+par+sms+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500201/normal_6033f9808a251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_5ff0f065a4e58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fe0474bb30e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_60061121a4109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_60435a1d67d83.pdfIn PDF document text
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/gokazojamexum.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/fedaforefo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_6003f10a890fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_5fe4520149100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458163/normal_600203f0bf850.pdfIn PDF document text
    • https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/3783759.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotamamum.epizy.com/resegidujowujogefok.pdfIn PDF document text
    • http://roworozirad.epizy.com/icps_guidelines_2016.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_3dbb6ff85b3e4f8e8f3d629a53018933.pdf?index=trueIn PDF document text
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_6a0a1d72ae8c4af9b44e7355add19c40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b6099f-b5e9-438f-bfa4-2ec854fb51c8/lyrics_cant_stop_the_feeling_timberlake.pdfIn PDF document text
    • http://nebopepebog.rf.gd/zazerokizulejexogaz.pdfIn PDF document text
    • http://gurepabe.epizy.com/what_is_another_word_for_365_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e30215-96e4-441d-91d1-a78ef23925df/fenimalilenapeguxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24835177-623e-4f8b-827d-94672eed2be5/husqvarna_viking_opal_690q_sewing_machine_cost.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_ec1d42ba83634c3a9f53cb7a7c14fe69.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 5316 bytes
SHA-256: fa1a1ffa95c513372fef78c982f3d18dc3f56c164aa38fb25beb74df4d078efd
font_01_sfnt_off000116b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 13008 bytes
SHA-256: 4b74d017f1210a0513af6c59ccebc30edd2daa916f75f11af500c2260a866e64
font_03_sfnt_off0001471d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471D 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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