Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b8b8aae78b4f48…

MALICIOUS

PDF

112.3 KB Created: 2021-05-20 11:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75ef8b84ee818ff1acf630a09b79a96 SHA-1: ddf2862ac956f3f225ba3430159985db42a29a92 SHA-256: c0b8b8aae78b4f48d40fc9dcc34a1276752c4f97177729cdfd06392eba566aca
156 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing operation. The primary URL, https://jacksth.ru/strik, is likely part of this malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or scamming users with fake download lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=minecraft+for+windows+10+master+collection+code
    • https://xuwapitevakud.weebly.com/uploads/1/3/2/6/132682402/5945472.pdf
    • https://cdn-cms.f-static.net/uploads/4486994/normal_6017a75ac9e9b.pdf
    • https://kiligazifozu.weebly.com/uploads/1/3/4/5/134506598/gowazatudedalazupale.pdf
    • https://pofekivivefuron.weebly.com/uploads/1/3/5/3/135339802/9679919.pdf
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/4892705.pdf
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5fe7519c4bec6.pdf
    • https://cdn-cms.f-static.net/uploads/4414848/normal_6047d3ad1d369.pdf
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/6958859.pdf
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/3c9336b118bc8f.pdf
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/lubosanivudagus.pdf
    • https://buzezofolo.weebly.com/uploads/1/3/5/9/135964700/4223403.pdf
    • https://visuriteja.weebly.com/uploads/1/3/5/3/135323353/60b6da7d5738090.pdf
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/4963122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d504abea-a50e-4429-8614-5211fcf94b23/kakubowenumijos.pdf
    • https://s3.amazonaws.com/zamemigojat/ditokudi.pdf
    • https://s3.amazonaws.com/zedilegol/wivizowifitevilerapi.pdf
    • https://s3.amazonaws.com/jevedijadiki/pekiduzoli.pdf
    • https://uploads.strikinglycdn.com/files/8e94d658-a46d-4bd8-9d2c-577f5ccde97f/zuwedezogasuvokuz.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/when_will_11_22_63_be_on_hulu.pdf
    • https://s3.amazonaws.com/poresi/90927788178.pdf
    • https://uploads.strikinglycdn.com/files/19385e06-5d12-4634-9bd8-b3cbc3ab0a23/vegikogisuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162e6.bin
a43fcca3701657c4605d7a557d73394821e5ec6382db09f27684a12c2dab68ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x162E6 5456 bytes
font_01_sfnt_off00017582.bin
a85ae0e7ebda75b466f88c29f4b7f4f106f0c04603dc98fcde8abf28d4cb7b43
pdf-font-stream PDF embedded font (sfnt) at offset 0x17582 11212 bytes
font_02_sfnt_off00019b9b.bin
39f200fa182eeaad9fa5de45768651a92dea61505552623144ea7572dbc5f804
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B9B 16204 bytes