Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e27455b45524e8…

MALICIOUS

PDF

33.2 KB Created: 2020-06-04 19:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 617fc502b2f1c83e856a62795acc836d SHA-1: d597ddd80964e2984ab30ad9bf9d1e5604c3b224 SHA-256: c1e27455b45524e8478e6b4dc03f66c73abb90e30536f9c0d3ca1aba986d7eff
136 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, as indicated 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. The primary attack pattern appears to be directing users to external resources through a mass of links.

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://wellnesscenternwj.com/uploads/1/3/0/6/130640092/130640092.html#p.r.+halmos+finite-dimensional+vector+spaces PDF link annotation
    • http://globalservicesenterpriceonline.com/uploads/1/3/1/3/131381553/jipodagebudo.pdfIn PDF document text
    • http://sharjahfeiworldcupfinal2022.org/uploads/1/3/0/2/130271077/2234576.pdfIn PDF document text
    • http://smtp.maximevap.com/uploads/1/3/1/6/131606762/nutebe_lemapofafog_nirerubirire.pdfIn PDF document text
    • http://evakyndt.com/uploads/1/3/1/3/131384696/lotupejinizasi-nuvipapolu-fokepoxojonevem-doropowu.pdfIn PDF document text
    • http://pointbreaksjv.org/uploads/1/3/1/3/131382680/e24dead445cd.pdfIn PDF document text
    • http://troop90scouts.com/uploads/1/3/1/4/131438324/lojuvifitalun.pdfIn PDF document text
    • http://wellnesscenternwj.com/uploads/1/3/0/6/130640092/terms.htmlIn PDF document text
    • http://wellnesscenternwj.com/uploads/1/3/0/6/130640092/dmca.htmlIn PDF document text
    • http://wellnesscenternwj.com/uploads/1/3/0/6/130640092/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wotilebuf.files.wordpress.com/2020/06/revulatuvirawepedizekure.pdfIn PDF document text
    • https://tofugubu.files.wordpress.com/2020/06/tigagepejenifa.pdfIn PDF document text
    • https://tijusarufik163223274.files.wordpress.com/2020/06/84782902618.pdfIn PDF document text
    • https://pegubup.files.wordpress.com/2020/06/fizuxukamimalaso.pdfIn PDF document text
    • https://kaladamovala.files.wordpress.com/2020/06/47280664695.pdfIn PDF document text
    • https://mazewakipu.files.wordpress.com/2020/06/71450724927.pdfIn PDF document text
    • https://pafekuka479092809.files.wordpress.com/2020/06/95699630132.pdfIn PDF document text
    • https://zitipon.files.wordpress.com/2020/06/degajajebebiz.pdfIn PDF document text
    • https://zawapoja.files.wordpress.com/2020/06/61795871371.pdfIn PDF document text
    • https://ziboruxupebi.files.wordpress.com/2020/06/guzomuvidemebovis.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
🗂 Part of campaign: undesirable.us 3 samples

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_off000056f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56F7 9468 bytes
SHA-256: 624195b8d274495ff71dfe1bf2c083682b390ef11810acde394b99bea433ed7f

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