Malicious PDF — malware analysis report

Static analysis result for SHA-256 483c8fb5dc0ab6f5…

MALICIOUS

PDF

68.2 KB Created: 2020-11-20 04:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d617a5cbf0bcc1c9361a12f4aa2728e9 SHA-1: 9c200392ba968bb53cd8957705cafe5c92d01e99 SHA-256: 483c8fb5dc0ab6f5f70d16d8b2e7adea05882a4f796916e6c1ecf06cbb398196
186 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 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.
  • 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://trafficel.ru/aws?utm_term=alien+periodic+table+worksheet+answers PDF link annotation
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/4f31e9.pdfIn PDF document text
    • https://surudebed.weebly.com/uploads/1/3/4/5/134513173/rerinir.pdfIn PDF document text
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/xazubijem.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/rinozeleb.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/5247394.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/gijobo.pdfIn PDF document text
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/aa0d95dc74af.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/dobanuwixomolu.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/sizadagazagaj/99289599259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8da9f97-f284-4329-bc8d-7a4c3df37473/galaxy_active_s5.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/kavutabasugolenabe.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/xugaxitukadike.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_off0000c1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C6 5232 bytes
SHA-256: d81b122678fa21fbf7c9420dea73afd1e30422732f9dc343bc43a80f4cf1e65d
font_01_sfnt_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 10084 bytes
SHA-256: 3231b07cc31ef881095e458a5d5b3b7045606ef928ea327101a294a84dbdcf06
font_02_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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