Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e48ed467f927915…

MALICIOUS

PDF

75.2 KB Created: 2021-02-13 06:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 225590930c32e45b4f37258c152f836f SHA-1: 6f268190f041334213637b17b96366dc36719486 SHA-256: 6e48ed467f92791573b8cb417a6b6a6b649242d7a8162982f0d5f76d3eb2f68f
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with a specific URL pointing to a potential malware download disguised as an 'apk'. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic for a download button lure further support a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=qoo+app+invalid+apk PDF link annotation
    • https://lijafaxad.weebly.com/uploads/1/3/5/9/135989690/181629d6e3d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_601da16018a6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_5fe6f69e17e7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fc833c3e59e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447098/normal_5ff85295be563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_6025c06f88f4a.pdfIn PDF document text
    • https://zudomizat.weebly.com/uploads/1/3/5/3/135308615/tomunalusexijin_kekoj.pdfIn PDF document text
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/43039.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/c86cadc04.pdfIn PDF document text
    • https://lataladegizozav.weebly.com/uploads/1/3/4/6/134685495/xuvuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482191/normal_5ff61364a3623.pdfIn PDF document text
    • https://wixolovab.weebly.com/uploads/1/3/0/7/130776385/zubevijufababeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvowafavij.epizy.com/77579874155.pdfIn PDF document text
    • http://musarozopod.rf.gd/update_weather_report_in_kolkata.pdfIn PDF document text
    • http://xuresiru.epizy.com/poziropawanazokixiwove.pdfIn PDF document text
    • http://konevimojo.epizy.com/gopodedapijejozu.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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 4864 bytes
SHA-256: 8d19fc4dedee69c5ccb027b326450d789c293f47b88760a92581512e470b7041
font_01_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 11804 bytes
SHA-256: 8696c4b66585a3209b6a0569f9199f8a0a046e1d332dc90ca3057bdeddf1eca2

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