Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0f3539df454021…

MALICIOUS

PDF

75.2 KB Created: 2021-04-10 12:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 636460bcdc5a2293dbdd3fdced6670fa SHA-1: 23384996b1c9e9fe5c6a2511b5ed037610a10d07 SHA-256: 2a0f3539df454021377d26de303930abe8616b5fa196a61103e4ccf0f48c31a7
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs with UTM parameters suggests an attempt to track user clicks for malicious purposes. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://jacksth.ru/strik?utm_term=harry+potter+books+second+hand+sale PDF link annotation
    • https://cdn.sqhk.co/muvifisi/crlhf9i/samekofu.pdfIn PDF document text
    • https://cdn.sqhk.co/weridosotuk/ifghicL/19895537155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_600735c0dc5fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417818/normal_5ffc392d35114.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/jukatokebufelovez.pdfIn PDF document text
    • http://kaboliwup.mypressonline.com/caucasian_chalk_circle_stylistic_devices.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5fd7f0c3425b8.pdfIn PDF document text
    • http://kisegojunu.22web.org/astazi_este_despre_astazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_600be539c8d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496824/normal_5fdbe55f6537a.pdfIn PDF document text
    • http://kilekapalovuzo.getenjoyment.net/46928270074.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tanonarimunal.myartsonline.com/28798310714.pdfIn PDF document text
    • http://tujufevowupise.epizy.com/kirumunutonoxedumotafe.pdfIn PDF document text
    • http://wokezafuvix.epizy.com/latinezewesasofilekek.pdfIn PDF document text
    • http://siragen.epizy.com/how_to_play_bass_guitar_beginner_youtube.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_505288f99ffa4b669911eac75dc704fa.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_320e6e71122044a7a18dc7bb50705fc0.pdf?index=trueIn PDF document text
    • http://pimimozoji.myartsonline.com/78465879585.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_ef704913469249d0acb806287eb83fa3.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 5428 bytes
SHA-256: 74f13f9cb21aa37b1b914453f58c706f9e86661acf3277f85282836087777562
font_01_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 10420 bytes
SHA-256: d588aa581fed3f8f4e8021a29e911051c63a5b82df30e09a093ba306f00eaa58

Open this report in the interactive analyzer, or submit your own file for analysis.