Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf48d4f7664f980…

MALICIOUS

PDF

73.3 KB Created: 2021-03-25 03:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c1553dd3e84650f72a3a6a687d919399 SHA-1: 2c9084899772d40ad02cb1d0755e351b2276a25d SHA-256: cdf48d4f7664f9803778632ea27b35f0cdac721cf50bf075f792680998007aca
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 0.9998

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://xezojetit.ru/123?utm_term=how+to++spotify+on+my+macbook PDF link annotation
    • https://xotugakifegug.weebly.com/uploads/1/3/4/1/134131530/pevadiluwaj.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/igjiGgd/zig_zag_rolling_papers_ingredients.pdfIn PDF document text
    • http://tigesaduru.iblogger.org/jurnal_anemia_adalah.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/fotifinuf.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/1689bde88fe5.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/4467575.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/TD4ig3u/97266320137.pdfIn PDF document text
    • https://zukolipiniroti.weebly.com/uploads/1/3/4/4/134494738/gezina.pdfIn PDF document text
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/6809379.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowafirowelumex.atwebpages.com/agriculture_class_10_cbse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9129d69-1687-4dce-8da9-934244fbfeb2/dudebiguvigarirawapo.pdfIn PDF document text
    • http://zararogesa.epizy.com/fasusufewiwemajavowuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dd2937-22ed-44e2-9b07-dc7ee9a064e4/tamokuvegunesoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba5e900-995a-4bc8-9541-63f35c080847/73413349883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f235ee4-6fd5-4b3a-a516-52cf603b7f04/35288665458.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_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 6168 bytes
SHA-256: 0e87cd05f332aeb2a72b3daf131c0310eff8a4a40b86507956a7cca2f5d1d305
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 5392 bytes
SHA-256: c70515241f6b90e15c965de91e99cedd14b12ae050957b96aa6e7637b524f7f4
font_02_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 10772 bytes
SHA-256: bd0755770892796b2dc9119ba9f56c621afd8d7a543b2736539bd8fbeeb3c1c4

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