Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7e012bc572ad30…

MALICIOUS

PDF

74.1 KB Created: 2021-02-17 13:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 247eb9fce2f1dc4cf2a8283f0c0ca128 SHA-1: 4aa2dcb28e62c803f4012232ecce973ec68678a9 SHA-256: bb7e012bc572ad30981ee0bb146e3ab5c706afcbbae167798520a5ea7eac99d3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or phishing lure, with one prominent URL pointing to 'jacksth.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and extensive external links suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jacksth.ru/123?utm_term=traktor+s4+driver+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5fd0ed8aded3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_5fd068e512116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fca41b52c47f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496165/normal_5fe3c50359f0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_60087486c8e39.pdfIn PDF document text
    • http://letnesil.xyz/bagegotubegitubonisipajugu27wp.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/jjhhLyz/78014846384.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/temuzujuzevijepoda.pdfIn PDF document text
    • http://luminar2-download.xyz/28005688462rzii4.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/6748e5cbc6df95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413697/normal_5fef4988df514.pdfIn PDF document text
    • http://jilet2.club/56662858110195sl.pdfIn PDF document text
    • https://gimimelaxagoke.weebly.com/uploads/1/3/2/7/132740951/sumipipugeg.pdfIn PDF document text
    • http://gexafozo.22web.org/chrome_ing_proxy_script_after_sleep.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/1wsJjf6/merriam_webster_english_dictionary_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dikokek.epizy.com/mukofosabapum.pdfIn PDF document text
    • http://fudojozijenabux.epizy.com/8432517386.pdfIn PDF document text
    • http://lunujebof.rf.gd/75343794685.pdfIn PDF document text
    • http://novisagaxorom.epizy.com/whatsapp_dark_mode_apk.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 5212 bytes
SHA-256: 91dc08ed75ca4ce59bd28965cb9736b8f6712892eeaa7b09a874ee812a50256e
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 11528 bytes
SHA-256: ece0ca79f8c4086581c8719b381a690de7d724178ad984554b1d1ca0d1197431

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