Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15bcb1bcdf010f9…

MALICIOUS

PDF

75.6 KB Created: 2021-02-17 20:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2d5c8f85c45632842a7e63c85000b8fa SHA-1: a6877ea2b7bba82ff7c7e1910719de4d308fc50b SHA-256: b15bcb1bcdf010f92a038044771ecb2b1994897f53171f91a9697fa7da6872a4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/strik?utm_term=kelley+blue+book+value+for+used+cars+canada PDF link annotation
    • http://filfex.ru/rudoxetelesanubake6fcqm.pdfIn PDF document text
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/divigepapagilo_benozevikawob.pdfIn PDF document text
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/6608978.pdfIn PDF document text
    • https://lurekoba.weebly.com/uploads/1/3/4/0/134018443/dffce98fbe130.pdfIn PDF document text
    • https://fazipebafutemi.weebly.com/uploads/1/3/1/8/131857540/12baca9.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/f5e1a7.pdfIn PDF document text
    • https://malitizume.weebly.com/uploads/1/3/4/0/134097131/gabekowiwer-sotiruw.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/6179252.pdfIn PDF document text
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/figuvuri-jadug.pdfIn PDF document text
    • https://dejokorakas.weebly.com/uploads/1/3/1/3/131379117/sesuruvudo.pdfIn PDF document text
    • http://azalea.store/repotisod7er.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bulozor/5227137549.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/39990527841.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/99962462928.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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 5104 bytes
SHA-256: 76c37f8a0bd39175874124f0589671ec098fe8d163f114c0916575c235dbe4ed
font_01_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 10172 bytes
SHA-256: 9e4eadf8276dbfd295b4386a97cf9121b4c2c85f18c8a1911849f7cc0b6acaba
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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