Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc38bc35cd323f66…

MALICIOUS

PDF

66.0 KB Created: 2020-11-23 13:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4633f435bbf892b8ab864f04728d183e SHA-1: 21a774efb442b198740bf190c4a4fd5987557206 SHA-256: bc38bc35cd323f668e9b3d6376639ce56c49a25743e9a5628d1e10bbfc068ac3
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 by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. The primary malicious URL identified is https://traffine.ru/strik?utm_term=acs+chem+2+study+guide, which is likely used to redirect users to further malicious content or phishing pages.

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://traffine.ru/strik?utm_term=acs+chem+2+study+guide PDF link annotation
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/muzegizigup_wotivuzowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452626/normal_5fa9e83ecef43.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/6593777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fa60a2dae606.pdfIn PDF document text
    • https://xupuxagezizese.weebly.com/uploads/1/3/4/6/134613092/dd06ce17ac8fa.pdfIn PDF document text
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/bipexezuvemanibexo.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/dijomebasapav.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/sefepugolupalax/set_up_icloud_mail_on_android_device.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/abinaya_album_song_tamil_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084c2a74-7a21-49f2-9660-d4e03a577488/rose_and_angels.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/93796055985.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/xojoxujezazoxuvofuviwalij.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/kakogupuwolawixa.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_off0000c5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 5240 bytes
SHA-256: 61903d317c65fba6058e66abe6cd799d6a9329e56ef70f8c30afd5d9b3d0c4cb
font_01_sfnt_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 10608 bytes
SHA-256: ae7b960228458fec0a13505953d4f3e03ddab03f1ad5051469280b02504b61de

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