Malicious PDF — malware analysis report

Static analysis result for SHA-256 e308febf638933ce…

MALICIOUS

PDF

74.8 KB Created: 2021-03-18 00:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bb3fe6716b109a3d3aec1f57eb4582b7 SHA-1: 3c672e28f34e659b2ca909d84e5fe4fd77fe39cf SHA-256: e308febf638933cebe5c1eea9570583d745369341499ca232dc1b8b9479e615e
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 0.9998

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 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://xezojetit.ru/award?keyword=anaerobic+and+aerobic+respiration+pdf PDF link annotation
    • http://navaram.online/21320378119zftau.pdfIn PDF document text
    • http://digitalmedialit.com/tozavudasajidoxibe1qof9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_600a4e712df1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_6039bfee4340e.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/jazamerijekufol/41195570569.pdfIn PDF document text
    • http://fezesotufixodow.epizy.com/68807299994.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_72c9b962991f4e8580b3bf9191abc3ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/83823600159.pdfIn PDF document text
    • http://xirotowukutizu.epizy.com/shadow_priest_leveling_guide_classic_wow.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/53169426342.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/fanuvotomeve.pdfIn PDF document text
    • https://20c97958-0fd0-427f-b1ed-7bcddc8a5511.filesusr.com/ugd/c4dbd3_7b0fd897a0e94756a754d5bb1ab70287.pdf?index=trueIn PDF document text
    • http://nigukeja.epizy.com/wikilewenifefoxogam.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/lazojaf.pdfIn PDF document text
    • http://xonitobilabi.rf.gd/honda_5000_watt_generator_carburetor.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_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 5248 bytes
SHA-256: 49a8591ea59600934d583a1161d80286e022d03faad8949e399366e34593e88b
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10732 bytes
SHA-256: 1f531f042742ea34342ae4a7752ec36618d35ead5f63eea5accc6cd25afc32be

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