Malicious PDF — malware analysis report

Static analysis result for SHA-256 c051b62a0bc6a4cc…

MALICIOUS

PDF

37.9 KB Created: 2020-05-17 15:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 42a3f3554861fa85356093a902bc07a4 SHA-1: 8a06fd23a02eb67bbab79964c08be43e119b7eb0 SHA-256: c051b62a0bc6a4cc45fc9c0730254f89f7e0edb4f28eadc21e268386e9de5226
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution mechanism for further malicious content. No scripts were extracted from this sample, and the document body is heavily obfuscated, making it difficult to determine the exact user-facing lure beyond the generic 'Halloween party flyer template for club' text. The primary attack vector appears to be directing users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://joc-productions.com/uploads/1/3/1/4/131483267/131483267.html#halloween+party+flyer+template+for+club PDF link annotation
    • http://theartistandthekabbalist.com/uploads/1/3/0/3/130312972/8800704.pdfIn PDF document text
    • http://brothersofash.org/uploads/1/3/0/2/130271184/konovanupamip-kuserinuzebak-wetunerug-tumerokozapot.pdfIn PDF document text
    • http://freedombagz.com/uploads/1/3/0/5/130590637/df6741dac7d3.pdfIn PDF document text
    • http://kkmealprep.com/uploads/1/3/0/5/130543787/bumigutara.pdfIn PDF document text
    • http://designncoffee.com/uploads/1/3/0/4/130476976/74f9557dbcab649.pdfIn PDF document text
    • http://collegewritingsupport.com/uploads/1/3/1/1/131163536/9830639.pdfIn PDF document text
    • http://cr-routines.com/uploads/1/3/0/6/130604049/d37cc90d62.pdfIn PDF document text
    • http://vertexsyntheticturfsupply.com/uploads/1/3/0/6/130604509/9790616.pdfIn PDF document text
    • http://thebirthmamas.com/uploads/1/3/0/4/130483178/f37bb20c36e530.pdfIn PDF document text
    • http://hvb-consulting.com/uploads/1/3/0/4/130488223/penafaloxolad_fidorisofemi_fezolelaw_jeranapor.pdfIn PDF document text
    • http://ryanjalls.com/uploads/1/3/0/8/130874322/2577091.pdfIn PDF document text
    • http://rhodescoloursfestival.com/uploads/1/3/0/7/130739225/piduvijizawemoj.pdfIn PDF document text
    • http://amandajenkins1227.com/uploads/1/3/0/6/130621161/e4403.pdfIn PDF document text
    • http://drpauleyeschino.net/uploads/1/3/0/7/130738814/lolapeda-fesefi-gufuxi-vajunajumawave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

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_off000066e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E7 10908 bytes
SHA-256: f8914f3fdaf0a5dadde9aabcccb1db5a093c9d6a997790a45403db9107e9db7c

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