Malicious PDF — malware analysis report

Static analysis result for SHA-256 277af5d7b76c1d9e…

MALICIOUS

PDF

87.0 KB Created: 2021-02-20 01:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a86354a45667af240de1cb518ed6f7c2 SHA-1: 5206f8d6eb2d58512edc6f574554897f724e8346 SHA-256: 277af5d7b76c1d9e5b121dfaeb6c1637886a4a3402dd5e850123ff3237d0bcdc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. Heuristics indicate the PDF is a link farm on disposable hosting, designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=fresh+off+the+boat+meaning+urban+dictionary In PDF document text
    • http://present-mag.ru/145108436158ebys.pdfIn PDF document text
    • http://lg-copyrightforms.com/961478188678mola.pdfIn PDF document text
    • http://dithetsen.xyz/74964242042sdtr6.pdfIn PDF document text
    • http://itrom.fun/549350414365kt6z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384817/normal_5fdf85fe9f977.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/68960658539qh51y.pdfIn PDF document text
    • http://pumba-timon.space/21607995247fe14u.pdfIn PDF document text
    • http://okstore.info/83700166062med80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_5ff2cd3361566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fe291b81df67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwovedivaz.rf.gd/is_the_secret_life_of_bees_a_good_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/netflix_premium_apk_onhax.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/waupaca_buyers_guide_rentals.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/xukuta.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/novedona.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/loliwatugedeba.pdfIn PDF document text
    • http://piwalalif.rf.gd/20900794913.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 5600 bytes
SHA-256: 25c3f7551d47099143bd41d458fa9cba649ec1d297b19cb9bfb47d02bdf0114d
font_02_sfnt_off0001261a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 11904 bytes
SHA-256: 5c8fc43f69de20e12b3685b15372617178b0f0cdda33b18f152b0a59af87d941

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