Malicious PDF — malware analysis report

Static analysis result for SHA-256 181769087f40b499…

MALICIOUS

PDF

74.4 KB Created: 2021-03-22 00:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 15885cc20a0b1457f80685c7f8d2ac03 SHA-1: 27e9517c1789a5a9deee070c809ad09fccccea7c SHA-256: 181769087f40b499fdc3ab4ed7a9826189b643c886cb84d10edd5b3e4164fb31
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 redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=nouveau+look+pour+une+nouvelle+vie+jacqueline+et+sueva PDF link annotation
    • https://cdn.sqhk.co/nogegamapagi/cd2hjjQ/poxebe.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/6jbjb5P/41511319271.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/fXggiiK/23021293576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boligasenupe.rf.gd/lemirarubow.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_07f47d8dcfad4971b36e83414d0a91cb.pdf?index=trueIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_8a88b02f266e41e0b95b513c9e54d579.pdf?index=trueIn PDF document text
    • http://fepoxojosatomu.epizy.com/95789171696.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_fd71f417f2b24e7880b2a9853873e14d.pdf?index=trueIn PDF document text
    • http://zuvidetalenaras.epizy.com/52843420094.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_b4004796dd3742f0a21c3b0f41071397.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_baee19b085ec40c7927df5f20737d343.pdf?index=trueIn PDF document text
    • http://fozabenisos.epizy.com/beyond_band_songs.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_4b478e81095b4881bb2fe169b89a21fd.pdf?index=trueIn PDF document text
    • http://jivatufuwofed.rf.gd/yearly_home_maintenance_schedule.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/nujajarowobedubono.pdfIn PDF document text
    • http://xubulaxojetuka.rf.gd/dutobasutijomawujex.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_a11e764a546541d58b174bcf7d3a80b6.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_72fecaa0ca6c416593e86c74df616689.pdf?index=trueIn PDF document text
    • http://mujevevurisul.epizy.com/88279657370.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_0065724a37754b76a9da6ffa610ce76c.pdf?index=trueIn 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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 5224 bytes
SHA-256: 7db0bfbee4c42a577b0e0a51070a5a813916b0c7b6a7cdd0e3e7fd1aa9e83b73
font_01_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 12916 bytes
SHA-256: b2f44eef9f8a4d986f54d7eaafb93d5be30a56b43d4a29ef00169bdc3ebed327