Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a6eee8e546263e…

MALICIOUS

PDF

66.1 KB Created: 2020-06-12 04:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: bf1e3c5fbf953e600b80cea6d53d94fb SHA-1: be8be0f0b1df7e246886996ff5a467fe8416fb50 SHA-256: 54a6eee8e546263e31fa647ce176fa8e41a5d7a4fa53a386a16f328dcc3c4868
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, many of which point to other PDF files hosted on similar domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text related to 'integrated music lesson plans' and the wkhtmltopdf application, indicating a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of suspicious external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://herbandfeather.org/uploads/1/3/0/4/130435783/130435783.html#integrated+music+lesson+plans PDF link annotation
    • http://balholmarchaeologicalillustration.com/uploads/1/3/0/5/130589328/lujuwibi.pdfIn PDF document text
    • http://mytexanlife.com/uploads/1/3/0/4/130489241/8963345.pdfIn PDF document text
    • http://yikaloaraya.com/uploads/1/3/1/4/131438556/2558833.pdfIn PDF document text
    • http://andreabauchowitz.com/uploads/1/3/1/3/131380341/ravexov.pdfIn PDF document text
    • http://remodelorlando.net/uploads/1/3/0/4/130483906/xozomon.pdfIn PDF document text
    • http://exquisitepoolsandlandscapes.com/uploads/1/3/1/6/131606809/botufex_debeguk.pdfIn PDF document text
    • http://noreply-27.info/uploads/1/3/0/5/130541462/jinivafane.pdfIn PDF document text
    • http://smartstateelectricalservices.com/uploads/1/3/0/6/130621351/najipajurujapob_jatubezusirez_luragatudojudig_nofesebuvebu.pdfIn PDF document text
    • http://doubleheartsoapcompany.com/uploads/1/3/0/3/130312952/2612be8f6ac7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fesedaxunag.files.wordpress.com/2020/06/26217735420.pdfIn PDF document text
    • https://kulovop.files.wordpress.com/2020/06/rolegituxon.pdfIn PDF document text
    • https://vuvopiberuw.files.wordpress.com/2020/06/nidurumokesutitotoromosij.pdfIn PDF document text
    • https://funererole.files.wordpress.com/2020/06/guxofedefolujegir.pdfIn PDF document text
    • https://gakirebeb.files.wordpress.com/2020/06/kigusem.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 11084 bytes
SHA-256: 56fd29f53cbb0d6a51df66605bc2f928125fca185a6c36182986aef25b5c3eeb

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