Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb655cb1638a096…

MALICIOUS

PDF

70.1 KB Created: 2021-01-11 13:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6c432cf755dd72bf4650459164267c72 SHA-1: 81c38515edec332a92c3091ee87bea851cbfa4b1 SHA-256: ddb655cb1638a096dafc447f94fa99ea442a1146a8adba6f95e4f4c02deeb3c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://traffking.ru/aws?utm_term=adornos+en+crochet+para+navidad+manualidades PDF link annotation
    • https://site-1177129.mozfiles.com/files/1177129/61251941200.pdfIn PDF document text
    • https://site-1172317.mozfiles.com/files/1172317/mediamonkey_android_album_artwork.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_5fb34790e6b07.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/7572044.pdfIn PDF document text
    • https://site-1174654.mozfiles.com/files/1174654/91824966982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449012/normal_5ff65c3932451.pdfIn PDF document text
    • https://site-1175994.mozfiles.com/files/1175994/ninapovesapagoj.pdfIn PDF document text
    • https://site-1179601.mozfiles.com/files/1179601/affirmative_action_prop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5ff8d78d93a26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5ff17c7d1a3f6.pdfIn PDF document text
    • https://site-1176222.mozfiles.com/files/1176222/30070216796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f87165870115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f975476c1f53.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/sugaguxagu/kifuripotejarube.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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 5364 bytes
SHA-256: 27c1226fee85f4d6f475815a1332d583ade15ee9495173f396cdcfbf675d69fd
font_01_sfnt_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 10836 bytes
SHA-256: 7a735e7895f2678813154289446c3e0344f7d5a3054d2dbda413881d27827c76

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