Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41029bb3c564f02…

MALICIOUS

PDF

139.4 KB Created: 2021-02-16 12:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bd8d273ed4af93a20aeb9a67029768db SHA-1: f9ea7d2bf0ce207b72183c049e36d8dbf3a405f1 SHA-256: b41029bb3c564f024d9a49c14e08be7880cce10d1fd762103bc20927ca22c199
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 hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://jottigo.ru/strik?utm_term=tabla+peri%25C3%25B3dica+completa+pdf+con+valencias` is the primary indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=tabla+peri%25C3%25B3dica+completa+pdf+con+valencias PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454671/normal_601b7caa3fb48.pdfIn PDF document text
    • https://punujagenak.weebly.com/uploads/1/3/0/7/130775029/denuf.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/5560378.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/bifise.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/rhhHdgi/gikax.pdfIn PDF document text
    • https://fofalada.weebly.com/uploads/1/3/5/9/135968840/pavofoge_bikanogi_divadogon.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/fZvpjir/2268480563.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/Pc2uegc/pevezola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_600bef330e0eb.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/gghgdgf/tanglewood_apartments_phone_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felepukagerek.epizy.com/3397130297.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/53328188609.pdfIn PDF document text
    • http://sumabaxesopev.rf.gd/39608135944.pdfIn PDF document text
    • http://nemagigorame.epizy.com/zenidadebujutinipefexa.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_off0001d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D736 2960 bytes
SHA-256: a31aedb3fe800cd2b5c0120397ec9570e12c7cc97febb81e3d6171160c50e6bc
font_01_sfnt_off0001e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1B8 5588 bytes
SHA-256: e5eb3749f6e5115f143b8350599f75e5ded758f9bb1a0040a901f1c5828e0c74
font_02_sfnt_off0001f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F45D 12576 bytes
SHA-256: 5dda7961f1f3f5048f964dcc6c668596e5c0117a7289fc8f8ec7eb9867f992b1

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