Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaeb802ba896dce…

MALICIOUS

PDF

76.1 KB Created: 2021-03-25 13:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 245add33b806f038ad2c41ca6873b700 SHA-1: c544928e7b0cd5f7aa15a14197267a1d65ff27a3 SHA-256: bcaeb802ba896dce1836af5c496c266999ebac8db151e9dbc9ef1b9a9d3a5b73
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, suggesting it acts as a link farm to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure, possibly related to a recipe, to trick users into clicking the malicious links.

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 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://kuzutuzo.ru/wix?keyword=scali+bread+recipe PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407064/normal_5fcf50522ee8a.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/cancer_de_prostata_articulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_603f4d2aa8efd.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/87529877674.pdfIn PDF document text
    • https://cdn.sqhk.co/zamepeja/iuiahdw/sunaje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5ffc1b018d8e6.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/kofofemimowajev.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/gPgciaA/2185075613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fcaf19aa7497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_5fda8cc389ed1.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/mejasezim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_601838809d78f.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/arduino_8x8_led_matrix_max7219_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_ad7eac2685bd49b7a9a8f29811b7acb3.pdf?index=trueIn PDF document text
    • http://kitilogokufalu.atwebpages.com/93608165888.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_b217e49bc4f44a0195d8b7b542470693.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_2c2bfc8ab21844eaac53b0e9637dda0b.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_b37167ca5efe4cf3a65d7b01607a0460.pdf?index=trueIn 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_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 5132 bytes
SHA-256: c2fd7e953d333545096d646191c336358fa274fe94508d4746e4afb3d29a00fc
font_01_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 10668 bytes
SHA-256: 377fdba88cc7da5dfd313ddeca9871b3cf4ec921dfaac5ea11c0a799fa517dd1

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