Malicious PDF — malware analysis report

Static analysis result for SHA-256 962cf3498ce9e2ea…

MALICIOUS

PDF

79.5 KB Created: 2021-02-21 18:35:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f68bb10d75f47c35ab6b1ca94a12a3cf SHA-1: 6ebaaf54f1cc4dfc2b6c6c2a875aee74ca48dd95 SHA-256: 962cf3498ce9e2ea21f6b40fd50e400a1feef3d3a9a2649cca021b7b05f8a39b
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/aws?utm_term=stillwater+ok+drivers+license+testing PDF link annotation
    • https://zalidumi.weebly.com/uploads/1/3/5/3/135351231/9720882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422135/normal_5fe4e20aaaa73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_5fd670253a37e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60183e4590d48.pdfIn PDF document text
    • http://goduvide.22web.org/siwelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_6026935ae1fea.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/O5jcpij/zedge_free_ringtones_iphone_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/viwoxuz/96470348855.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/allotted_verb_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/mystic_messenger_call_times_guide.pdfIn PDF document text
    • http://gigolovumiguse.rf.gd/84772962409.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/free_ebook_reader_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/tojolu.pdfIn PDF document text
    • http://texaliborobiko.epizy.com/vururoferuvewanozuwewu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 5216 bytes
SHA-256: 2859cbd2b7cdda851cbb94865e250e0b2d860816ed3a460eeb7a9ac904db8418
font_01_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 10604 bytes
SHA-256: f2862e506fc0cf19d9a3e6bef7ae9056c91781de51d3e782750b73f100f6ef5e
font_02_sfnt_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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