Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3394208288136b1…

MALICIOUS

PDF

37.1 KB Created: 2020-06-04 07:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: b9c5b817e28928b2205c006b3e11620f SHA-1: 23174c9f804fe29b7ecba93406f07f59c153b830 SHA-256: a3394208288136b19a2610c85e4caeff300f7bf3cfb2460f6efd7d46bb241cc7
116 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to other PDF files hosted on unrelated domains. This indicates a link farm or SEO poisoning technique designed to distribute malicious content. The primary URL http://coastlinetilellc.com/uploads/1/3/1/0/131070627/131070627.html#ejercicios+de+ecuaciones+cuadraticas suggests a lure related to quadratic equations, likely to mask the malicious intent. The embedded JavaScript stream is a common method for initiating exploits or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://coastlinetilellc.com/uploads/1/3/1/0/131070627/131070627.html#ejercicios+de+ecuaciones+cuadraticas PDF link annotation
    • http://saxxdsign.nl/uploads/1/3/0/2/130289239/7236338.pdfIn PDF document text
    • http://sunkissedclothing.org/uploads/1/3/0/6/130603937/kamanomefoj.pdfIn PDF document text
    • http://extensivecleaningservices.co.za/uploads/1/3/0/7/130739141/8241325.pdfIn PDF document text
    • http://dukesrefrigeration.com/uploads/1/3/1/4/131438541/rakinofejufozunoso.pdfIn PDF document text
    • http://plaldershot.com/uploads/1/3/0/5/130588966/03d323736c.pdfIn PDF document text
    • http://lashonpringle.com/uploads/1/3/1/6/131637248/5416868.pdfIn PDF document text
    • http://mta-sts.mail.sprachheilschulebern.ch/uploads/1/3/1/6/131607110/gelajogis.pdfIn PDF document text
    • http://coastlinetilellc.com/uploads/1/3/1/0/131070627/terms.htmlIn PDF document text
    • http://coastlinetilellc.com/uploads/1/3/1/0/131070627/dmca.htmlIn PDF document text
    • http://coastlinetilellc.com/uploads/1/3/1/0/131070627/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dipenafuvepe538297139.files.wordpress.com/2020/06/liwipofafobuzenid.pdfIn PDF document text
    • https://wifuxew.files.wordpress.com/2020/06/77143146618.pdfIn PDF document text
    • https://mugitemos.files.wordpress.com/2020/06/56412139681.pdfIn PDF document text
    • https://towuferenin.files.wordpress.com/2020/06/92823177462.pdfIn PDF document text
    • https://duxuvarilak.files.wordpress.com/2020/06/77621104865.pdfIn PDF document text
    • https://sajukimu.files.wordpress.com/2020/06/42932502206.pdfIn PDF document text
    • https://nakavixolon.files.wordpress.com/2020/06/gowibenawiworakagux.pdfIn PDF document text
    • https://wilewivim.files.wordpress.com/2020/06/89772693183.pdfIn PDF document text
    • https://sejidinaduk.files.wordpress.com/2020/06/tafofefotekabajuge.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_off00006144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6144 11244 bytes
SHA-256: fcc4a3734bf208ad040924e2889323e2d06b4ac26ab04aa9c05963330f8524e8

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