Malicious PDF — malware analysis report

Static analysis result for SHA-256 59728397a3b61008…

MALICIOUS

PDF

66.5 KB Created: 2021-02-26 02:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e022b32bdfc086dc26e236eedf936bd2 SHA-1: df7bfd3bcdc443a7c4ad44105129020d35d04b9e SHA-256: 59728397a3b6100812b91b0d3196151b24591cbdffb8f307beb0e5d77865f954
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://crophysi.ru/wix?keyword=arcade+apk+offline'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://crophysi.ru/wix?keyword=arcade+apk+offline In PDF document text
    • http://0fruits.space/new_rock_music_october_2020jh9l4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_6001041bb841c.pdfIn PDF document text
    • http://katipef.medianewsonline.com/what_is_the_capacity_of_kenmore_90_series_washer.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/gazapu_bixud.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/spal_as_80_installation_manualmh8ok.pdfIn PDF document text
    • https://zelogevoge.weebly.com/uploads/1/3/1/4/131483318/8016d.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/satix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481417/normal_5ff7682a17263.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/ce2fc6dac3aa9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/86358650344.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/wuzolalewilizekano.pdfIn PDF document text
    • http://nununad.myartsonline.com/officejet_pro_8600_ink_cartridge_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/32824974086.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/jekarevibebafu.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/31775845965.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/gaviboxajadadupirofug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 5024 bytes
SHA-256: 57985da1e38e58efc52603b14486d3115501687e4e41e4fb78ddbb19673e3b47
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 9780 bytes
SHA-256: 915941088049030b51412bf7022dce694ea1ecc8498b64474d081260e40ea16a

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