Malicious PDF — malware analysis report

Static analysis result for SHA-256 984b33e407fa4a34…

MALICIOUS

PDF

72.7 KB Created: 2020-12-21 06:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ba6cec4b1825fe55388876470c288b76 SHA-1: 9ec6589abe539f3db708fd3662084cd3f8df8a44 SHA-256: 984b33e407fa4a34bd48916ed8efc5cece0714fe2decc5203bf8fb34869ca459
164 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. It uses an invoice-themed lure. 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 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafficel.ru/strik?utm_term=rolling+stones+logo+transparent+background PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5fa42ce4374b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5f9072f3aadfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5fcf3951b646a.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/1831710.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/zefetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdcb8f07619a53deeff8ff0/t/5fdce78c4e32734bb8cae428/1608312716997/89000872102.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/facebook_lite_search.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b544c89e1c4b8fbd6471/t/5fc3dcdc3485235c863d1bb6/1606671581630/islip_airport_parking.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/13400152742.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc123f2e2fce462bc8d6747/t/5fc5ba413485235c868d2396/1606793794741/31457144826.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/twitch_leecher_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/nupil.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/xozasogagunidagerexol.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_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 5452 bytes
SHA-256: a96eb1f74078753749b127d8c45efbc6d1c9b0f4177be8ea76f8d8ed39e47ef6
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 10528 bytes
SHA-256: afe1267725b24b382add009df11617a15c9fdb9a951838c29dcbdde08f29a9de

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