Malicious PDF — malware analysis report

Static analysis result for SHA-256 db97fcb0527c7008…

MALICIOUS

PDF

75.6 KB Created: 2020-11-26 01:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3f917bb95d4a9237de77fdfc8e31ccc5 SHA-1: 93834ed857d9c0f062de5c3e6c675d3195d4bd67 SHA-256: db97fcb0527c700835ef9703d89a0092ea18e63ed81fc6635072c6aa35207a1e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://ggtraff.ru/strik?utm_term=assassin%2527s+creed+odyssey+patch+notes In PDF document text
    • https://kupejofep.weebly.com/uploads/1/3/4/5/134589233/piguxasi-sokisusabupu-nogum-razedejerata.pdfIn PDF document text
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/novozatapibupexevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f8742303b5fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda873b1-1d0a-4ace-8342-509645198362/imagen_personal_y_profesional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c979b97-70ff-4fe5-8953-28226e2e57ac/zugewem.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/micro_usb_splitter_male_to_dual_female.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/pumemojagatobifaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2055f3bc-ddf5-479b-a50b-b95ad4f8a0ff/53861031640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa718d3-82dc-4b1b-afed-07c6e1fbee68/87278566738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a689781-5234-4cce-8d36-c0e2d08d3500/is_the_samsung_s7_waterproof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d9d6f9-0117-4c64-8eb0-0eb946c87d31/icd_10_legally_blind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9389e7-5558-4fb7-82a1-e3a675b6698a/42262754783.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/wuxodadudamixopoli.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_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 5252 bytes
SHA-256: a0ee797879f06a2af7221f1f2e5e202288d2e40d2e509350b3730fcb4ad851dd
font_01_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 1912 bytes
SHA-256: 5ffeb62cc735427a844e4fc30fe3f408afa3be4b10dd737b69049c1a099b5cd9
font_02_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 11648 bytes
SHA-256: 5d2ce6cf1529ce18c885d35cb8647765f70b9306df5e6010c8df3dcf6dbdd2fa

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