Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c7548d6af79517…

MALICIOUS

PDF

67.4 KB Created: 2020-11-18 08:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1e64df0124af725f8770b3893c5cece4 SHA-1: d7d3f61c0e9857de9ba517daa9059320b48a77cc SHA-256: f3c7548d6af79517eff79d2f46a53b985cd4ba9f49e69a7fcef1c2f58511bc8d
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://traffine.ru/123?utm_term=ginger+baker%2527s+air+force+band PDF link annotation
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/9b5f2a.pdfIn PDF document text
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/2967304.pdfIn PDF document text
    • https://pafuwaron.weebly.com/uploads/1/3/4/3/134385690/7868476.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/edbce265d9.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/kivariz.pdfIn PDF document text
    • https://dejigusadimegog.weebly.com/uploads/1/3/4/3/134324817/vuzawowe.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/tutag.pdfIn PDF document text
    • https://dukutisanag.weebly.com/uploads/1/3/4/3/134318107/fopexe.pdfIn PDF document text
    • https://bowogemiris.weebly.com/uploads/1/3/4/3/134316512/465ad894.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/boperotifapinigu.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/zesotat/xupatir.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/deadlock_in_operating_system_tutorialspoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b92fe2-978e-4a1e-9080-db40d2a379e5/60821110519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc8dfca-7dfb-4286-953e-9c3e03a4ec77/ouvrir_avec_word.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_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 5428 bytes
SHA-256: 7b3481c008db0c937182164acd34644f1bccec60ab56c1ad11c0e134793d20cf
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 10012 bytes
SHA-256: 337b1a6303acaa9961c17ca5478b32832e6795b440c8af803f291d48647bca1a

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