Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff71ac5fa62b300…

MALICIOUS

PDF

61.5 KB Created: 2020-12-04 14:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f59eb0d51d72ffb13d1a0b2f44e76343 SHA-1: b300998f7944a16dfb4265daacbca41a0eb691f9 SHA-256: cff71ac5fa62b3008fee2450994d26fda5b1a73ef8d62ef1dcc07f35683ec9b0
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/123?utm_term=danby+countertop+dishwasher+manual+ddw611wled In PDF document text
    • https://dedejabo.weebly.com/uploads/1/3/4/8/134875177/sakizufitadexo.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/c7265f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f97075c786c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f9ee22b01c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_5fb2c89133227.pdfIn PDF document text
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/kujak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc28402be9b69395115071f/t/5fc8138e8bd779356741ee27/1606947726979/64187730580.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36408403f5353fda5a38e/t/5fc442e5173fb5383b2ab262/1606697702005/tobabomukuwesame.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5cfc716f6d44b07e04109/t/5fc7b1b21d689b68bfa4b584/1606922674366/nasal_cavity_cancer_symptoms.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d0065e8e827d428d60b5/t/5fc2419b9ee0f32b879d5975/1606566300036/28246492768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a15005-970b-4860-b2c8-8f4d4e7d30a4/53310758466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d450476c-c6df-4fb8-95a1-4c2a7c7c8b3a/72450529255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4523645f-b045-437a-ad55-103a72660cd2/sony_ericsson_p_800.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_off0000afe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE7 5852 bytes
SHA-256: 770e4ba7dd341c480107b01f5b6f8a024be4548e729dc32f22dec026cc1b4d3c
font_01_sfnt_off0000c3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 10528 bytes
SHA-256: 56bf9974e485e449db7ed6f3cd3c74884cfd2f0d0c912d5c342ccf484a294057

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