Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f91960e05c29bcc…

MALICIOUS

PDF

87.8 KB Created: 2021-01-13 03:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4bbdb31655151fb82ba4df6191ca5e18 SHA-1: e0e8fc0c4bb37a0e7d3e401f5e6c35d9ae936dcd SHA-256: 4f91960e05c29bccea61973899f7eafec2c4c89c0d089bb34cdb13b0ac9dbd47
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging it as a 'Fake invoice / payment lure'. The presence of multiple unknown URLs suggests a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traffking.ru/aws?utm_term=shopee.+sg+app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411228/normal_5feec1281cf68.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/tixemupura.pdfIn PDF document text
    • https://pisubamu.weebly.com/uploads/1/3/0/7/130740412/8299979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5f9d110b13f9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f8fb269bfa7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5fc08a23ba4e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5f978be34f91f.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/dovulavavo/67799401950.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/55426896750.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/anstoss_2_kostenlos_vollversion.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/59602530801.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/63398117756.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/bassett_s_licorice_allsorts_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/clocks_coldplay_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/reflective_teaching_journal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/causes_of_obesity_essay.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 4640 bytes
SHA-256: e12ea64ff691b56b3d50ca2f957e197f6e8bddedd7359a740d67fffad21c91b8
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 2396 bytes
SHA-256: a4467211b5e98b296729de5ea674b58500ada196b4c0f47efadfa70ed845a0aa
font_02_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 11336 bytes
SHA-256: fce4462e065db2f9cff50f6ae544fccd7e88cf87b3117cbe60e165acf002ac6c
font_03_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 16548 bytes
SHA-256: 5a9a389329e2f98cbb6a38ba9676eecd4f71a8fdfb2d431e10a3a9b88aecfee4
font_04_sfnt_off00014312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14312 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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