Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a5abceb8458796…

MALICIOUS

PDF

77.5 KB Created: 2021-04-08 08:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00eee582469a7eaafdf6266adee9dae0 SHA-1: c8ec2199f6a76a3c7a7fc9fb7e954a692bfe1bd3 SHA-256: 25a5abceb8458796d84cdb55e6fe4788ac478b059011e1d30aec99325b16d63f
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to payment redirection lures, aligning with the 'SE_PAYMENT_REDIRECT_LURE' heuristic. The primary IOC is the redirector URL, which is likely used to deliver a second-stage payload or lead to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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/123?utm_term=put+chloroform+in+a+sentence In PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5fca64db085b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_6061690d97f06.pdfIn PDF document text
    • http://reliables.ru/20946863813yotka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5fc9bfb47975a.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/dhghjih/nelib.pdfIn PDF document text
    • http://rubeatyshop.xyz/rezivokivatus4w84t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387233/normal_5feecce1a96bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_603da62c8436a.pdfIn PDF document text
    • http://klokisik.space/hotel_booking_form_ielts_listening_answersgabav.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/cihGjfq/44936167078.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/heEtYkj/aaron_rodgers_wife_destiny_newton.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5ffb9ff193d00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_601d2a986deab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumusilofinufaf.rf.gd/how_to_connect_bluetooth_mouse_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/23241336479.pdfIn PDF document text
    • http://bizozominam.epizy.com/58933956061.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/camera_fv-_5_apk_for_ios.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_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 5124 bytes
SHA-256: d1f70b89f4472a2badea7525b496ddd8fb5b41d9fc308048ceeefa44bc3250b4
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 11028 bytes
SHA-256: 56d29b71b7e9d7721b0ae0cd056c32cc1d644b4673e6c2003901f8bc1e2c51b2

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