Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44c6e4040bd6ec8…

MALICIOUS

PDF

75.7 KB Created: 2020-12-26 03:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9dd80a5818481704b298c24a4081b914 SHA-1: 8a353747a34e61eba13af4732ee6a64d00b46b87 SHA-256: a44c6e4040bd6ec8ea08dc61312f2f3f9a936688ea7b1e4ee1294713bccdf3b4
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The presence of a 'download button' heuristic further suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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
  • 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/strik?utm_term=new+zombie+catchers+2+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_5fa58644f10f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_5f9684239fa94.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/fd4c6c3b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f925a39120cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422879/normal_5fe6873b66264.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/482ca6095dc459.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/vojopevaramoror-robexuxoj-pavugejasinesun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fce2466da876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fde14aba051b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_5fb90daeb9848.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/nazibipedan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/2010_subaru_legacy_repair_manual.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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 5564 bytes
SHA-256: 5f96f016b93b25a4ad573e710d9c3d464f016abc91b3950fd948fdca5d917926
font_01_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 10888 bytes
SHA-256: 19cea6b76c01d1a1807eb6084e93c6f9c4392d64899762a3af697035fac5ae7c

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