Malicious PDF — malware analysis report

Static analysis result for SHA-256 5546f13649f864ed…

MALICIOUS

PDF

51.7 KB Created: 2020-06-05 10:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 8d5e45d78655521648ba7ac59fe4756a SHA-1: 80eaa9e71b360ec9f42ce57ea1473a613c82aa11 SHA-256: 5546f13649f864ed2a1cf30cf296ce3bd83647e6186b1a7d69d30d183404f3d4
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This suggests a link farm or SEO spamming operation, potentially designed to distribute malicious content or manipulate search engine rankings. The document body itself contains garbled text and metadata from the wkhtmltopdf generator, indicating it was likely programmatically generated to host these links.

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://aviplan.net/uploads/1/3/0/2/130287842/130287842.html#a+moneta+tandil+hor%25C3%25A1rios+mundiais PDF link annotation
    • http://biz2vacontracts.govcontracting.org/uploads/1/3/0/6/130639114/93f50.pdfIn PDF document text
    • http://admin.mortgageandinsurancematters.com/uploads/1/3/0/7/130738831/2762f5a93906621.pdfIn PDF document text
    • http://canberradoula.com/uploads/1/3/0/9/130968921/tofobodepemobefonuf.pdfIn PDF document text
    • http://zenruncoaching.com/uploads/1/3/0/6/130621179/39f1b97ae04.pdfIn PDF document text
    • http://pab-ilo-hpg8.pabottlers.com/uploads/1/3/0/6/130604307/dasire-nexovaw-boralubaz-deposar.pdfIn PDF document text
    • http://sacredfest.co.za/uploads/1/3/1/4/131483029/kadijiradatule.pdfIn PDF document text
    • http://hometune-up.com/uploads/1/3/1/8/131872042/vipipivuru.pdfIn PDF document text
    • http://scarlettchou.com/uploads/1/3/0/7/130775247/8906746.pdfIn PDF document text
    • http://autodiscover.llrecognition.com/uploads/1/3/0/5/130588850/tuzadugejejafe-sobasufitewu-nivape-roline.pdfIn PDF document text
    • http://aviplan.net/uploads/1/3/0/2/130287842/terms.htmlIn PDF document text
    • http://aviplan.net/uploads/1/3/0/2/130287842/dmca.htmlIn PDF document text
    • http://aviplan.net/uploads/1/3/0/2/130287842/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fofunifoxetu.files.wordpress.com/2020/06/sukiduwuxuputewisamen.pdfIn PDF document text
    • https://jagunijo.files.wordpress.com/2020/06/bovinepeparefamexiba.pdfIn PDF document text
    • https://tizatovizux184684867.files.wordpress.com/2020/06/88753426659.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 1

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_off000097c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97C7 13276 bytes
SHA-256: 7845ce027d83033843cbb6669f7a1216aba635d68da1d35e9e152e514de8afd0

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