Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c6555c7b665eeb…

MALICIOUS

PDF

75.6 KB Created: 2021-02-26 11:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2670e153cab70c63f11fd9239198c027 SHA-1: 104b42a06a799e53fb2c636e6d5d787d29331f07 SHA-256: 30c6555c7b665eebbc39d5e9595cecc2474a29028f6af8c30ea113ce7a77a820
146 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 a QR-code lure. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://leonvi.ru/strik?utm_term=dsc+832+user+manual PDF link annotation
    • http://baugroup.info/xibiwojovafepuxekopotuvd00k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fc8cefa29693.pdfIn PDF document text
    • http://itgermany.net/macroeconomics_5th_edition_hubbardsrzqj.pdfIn PDF document text
    • https://cdn.sqhk.co/mamuxejoxe/b8Idicn/pavifigaxunuvikeruxupo.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/iJr8Njg/pop_time_kettle_corn.pdfIn PDF document text
    • http://mamajan.space/33804456949m128l.pdfIn PDF document text
    • http://avto-document.site/41183588831e1m9w.pdfIn PDF document text
    • http://pumba.fun/bosch_wiper_blades_catalogvfiay.pdfIn PDF document text
    • http://ueuniti.xyz/what_is_the_difference_between_central_cyanosis_and_peripheral_cyanosis53d26.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/hjgjhex/sawozatesanum.pdfIn PDF document text
    • http://arfesopt.com/nonorubedoxogodobugazon6.pdfIn PDF document text
    • http://robertferrell.net/72167089232nuemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rileponabamel.rf.gd/18418150595.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_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 5432 bytes
SHA-256: 26540632e26f07283d46ad1156555bb4d486824e0945e85cb8e8d27fcc69c386
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 10988 bytes
SHA-256: ec9b2a54b88b9420e1fbf2f456eb4ff2f67a1f96af4a87b39d1d65214c4074a4

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