Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81d16433a228882…

MALICIOUS

PDF

73.1 KB Created: 2021-02-05 21:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 248c80af0203dd4c4dc9b8bbfcb0f1da SHA-1: 8efec092ad3ab6344524d4b7a0153ba47a227b2b SHA-256: b81d16433a228882fc002ab70ab5fee52ccbd445c80373cb348a116386550dba
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm points towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=kings+road+mod+apk+download PDF link annotation
    • http://return-0.com/photosynthesis_lesson_planzua38.pdfIn PDF document text
    • http://cmbespaceclient.xyz/kenalojufukanutiplffgg.pdfIn PDF document text
    • http://libralab.digital/download_foxit_advanced_editor_portablez2v6i.pdfIn PDF document text
    • http://air-calm2.club/80702208443srcxo.pdfIn PDF document text
    • http://netewe9.xyz/pokapizekifiposob21kbn.pdfIn PDF document text
    • http://fasibada.22web.org/montagues_and_capulets_prokofiev_piano_sheet_music.pdfIn PDF document text
    • https://vatipevik.weebly.com/uploads/1/3/1/4/131407386/bugetu.pdfIn PDF document text
    • https://duxupanitazubo.weebly.com/uploads/1/3/0/8/130813094/notukonisikojuwi.pdfIn PDF document text
    • https://dejurepezuneron.weebly.com/uploads/1/3/1/4/131452785/c48973f725e.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/2681788.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/pabano.pdfIn PDF document text
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/piwizum.pdfIn PDF document text
    • http://takodevizol.iblogger.org/97283182371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gasigigi.rf.gd/house_rent_agreement_sample_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/53044092183.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 5404 bytes
SHA-256: 2768cea6f95b3c70608f352376704a2af0e2b06a31bcb16f933170d7860a27ac
font_01_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 14324 bytes
SHA-256: a38decc0b09774032e0945be547a5c8065bf5979eb0dba4b475136827ec85844

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