Malicious PDF — malware analysis report

Static analysis result for SHA-256 69845977f3728e5e…

MALICIOUS

PDF

70.3 KB Created: 2020-11-11 09:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d5265a85701adddc93696b69b8457546 SHA-1: bbcd41597068bcb9ddb69173c89da4a6c60a55c4 SHA-256: 69845977f3728e5e6a5e50e8d06406564782d24d28cc5ccb35fa355a22e6f004
246 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 brand-impersonation credential phishing. 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 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/e878d.pdf.
  • 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://traffnew.ru/strik?keyword=z+score+problems+and+answers PDF link annotation
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/e878d.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/maviki.pdfIn PDF document text
    • https://wepebagelokej.weebly.com/uploads/1/3/4/5/134583559/549f9b564df.pdfIn PDF document text
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/xiputuluzu_fexologititimiv.pdfIn PDF document text
    • https://fuzuvetidodevik.weebly.com/uploads/1/3/4/6/134637128/6984803.pdfIn PDF document text
    • https://vejurinunabesud.weebly.com/uploads/1/3/4/7/134705678/dalemeti.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/timafatafej/gp66_cleaner_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/more_than_anything_gospel_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f3951d-d9d8-47a8-91cd-cfe17ecfe9d0/24764951732.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/nozovemajepalomev.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/scorpio_sagittarius_cusp_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/493f0d62-8676-4786-96b1-4f1dce0e6623/piloxezujawakowabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d3ad25-94e1-4a34-9c7c-690ff9095b05/56063413167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7e2ead-bb36-4762-b44f-63a545bbc50c/calm_before_the_storm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1169354e-697e-4b5c-a274-0bc865929356/59065246605.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_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 5408 bytes
SHA-256: 30876a304e741112e94424815e45527561b968d583b0087ac2f34868c9790b76
font_01_sfnt_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 10712 bytes
SHA-256: 49fdfa0e29148efcab279f6585c98bf658589089d9a5d9abfb0ce264e35e11a2

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