Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf50198a2107c4c…

MALICIOUS

PDF

72.6 KB Created: 2021-01-06 19:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7200fbac1b727b5b48b1d17372d33726 SHA-1: 1e7593e0c06aed2284008a7aa16752a639368c01 SHA-256: 3cf50198a2107c4c976e8fd68c0c47bb18c255ab937fcf9d1cb7c3bfb8fb836c
214 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The document body, though heavily obfuscated, suggests a lure related to a bibliography. The presence of numerous external PDF links points towards an attempt to distribute further malicious content or engage in SEO poisoning.

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://cctraff.ru/aws?utm_term=bibliografia+vancouver+documento+pdf In PDF document text
    • https://badipixurer.weebly.com/uploads/1/3/4/4/134456466/6265721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5fc87de81ba02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5fa70683bbef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_5f97af25024ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f97d6cca70db.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/tojoxejafe.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/291195ce-1981-41d4-a936-5b4cdae4c575/rozotowametefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1fc454-2013-47db-bb0f-633fbdc92cee/fukejafawurelubezenojed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82b29e1-3dd2-4e1d-9ab4-2453282479d1/xitadarivojiruru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954eb595-5e02-44bf-87a1-7fb902aebba9/gotozelodov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cd60c5-2d02-4961-b24a-a8c97bdf1bbb/piano_master_2020_mod_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0a988d-1ac7-4cfa-b9b1-624b16965164/57672280256.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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 5544 bytes
SHA-256: 56625431035188e3af273061933f7121ab7cf3a6fd455e3b9ceb1eaf7bfde3f0
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 12296 bytes
SHA-256: 2af39aff4a3168a12b987905c032e1799acaeb9fe54b27b53667b2b17585a434

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