Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb510629c2061ef4…

MALICIOUS

PDF

73.6 KB Created: 2020-11-17 01:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 71ecad731216ea1fc890d5b4c3329263 SHA-1: 5ae23d729f71e80158fb00ec9ad3b14af7679e12 SHA-256: bb510629c2061ef480698be8a016d72bf62a6f71d5a6f4a0916b747dd7710a74
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 0.9997

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://trafffi.ru/strik?utm_term=pokemon+tower+defense+3+hacked+unblo PDF link annotation
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/bomajor_wexob_rejobafumifozus.pdfIn PDF document text
    • https://gupesasuxubigu.weebly.com/uploads/1/3/4/7/134717911/403d8b0d.pdfIn PDF document text
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/zavoduxidevo.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/doliverepiginezag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f89a6273c846.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/3440429.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/xozeb/gabiledanilem.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/gitobenifete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efaeb9a-d2a8-44a6-9405-548006c35557/diablo_2_weapon_runewords.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/dawejimevakokenotajofigaf.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/bemupagesidamebetus.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f1f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1F8 21356 bytes
SHA-256: 7cfaef5466b750c0c5e953b9c553198973eaa7b85508a431b94fea41008235cf
font_00_sfnt_off0000bfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFF 5720 bytes
SHA-256: b1160b7561f38d1210e8ec620af69e4c8b5e14d88e4bcd40a609417f5abf016c
font_01_sfnt_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 9252 bytes
SHA-256: 61570357723807b8e95f949a96fb85303b97382043a84279d605d632d005b506

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