Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd456d621f661a88…

MALICIOUS

PDF

91.9 KB Created: 2021-01-29 15:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bb39e62a1d8a42b15d97ca4e80b1946b SHA-1: 88a17562ea2b4258674a551b580317f4791f5eb7 SHA-256: dd456d621f661a88e3e2e78371bdb930a6c036874e3980fc98b89429f2f55c95
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, and another for a link farm. The embedded URLs suggest an attempt to direct users to potentially malicious or SEO-manipulated content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=separation+code+fbk In PDF document text
    • https://tuzisufuga.weebly.com/uploads/1/3/4/4/134458332/bugogadolonavupe.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/farafexasija.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/jitoniridawo.pdfIn PDF document text
    • http://beststudent.space/firazewakufuxewewagebj8l3.pdfIn PDF document text
    • https://muwegegedagus.weebly.com/uploads/1/3/0/7/130738526/zixizi-fuxuteduzobe.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/rojixatiluxilet.pdfIn PDF document text
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/loxenamugirenowi.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/vixuwogetiv/zesewinimanab.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/android_tablet_with_2d_barcode_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/2012_chevy_impala_manual_shifting.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/transfer_iphone_backup_to_android_phone.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_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 5248 bytes
SHA-256: efb1c0a6238ee6cbf0c85e5415b9aa27527e80a2eb8d558e56002867b3df4450
font_01_sfnt_off00013cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF2 11912 bytes
SHA-256: 2fdfed112ebed20d56f8880dbf9ef4a28a951ee4bd76068d8ae4543b9dbb0546

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