Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e5090c26304d5a…

MALICIOUS

PDF

72.0 KB Created: 2021-04-03 08:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 57c92baf39982fac9343a1995571a561 SHA-1: 3d3052ef579474257f64d352f860da95ace2eca4 SHA-256: a8e5090c26304d5a0b6a69c6a91222a06aecea1e72a827c196ee46c684020688
252 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary malicious URL identified is dafemum.ru, which is associated with a Samsung service manual lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/wix?keyword=samsung+rf31fmesbsr+service+manual In PDF document text
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/78877df7f.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/eigmEjd/79989331569.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/ejfxMja/65405101610.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/6hbXjja/37127599796.pdfIn PDF document text
    • https://cdn.sqhk.co/videbamez/Rrgfggx/first_strike_final_hour_free_download_ios.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/tolagexat.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/vonuxagupeduze/94484143124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c70a6ff-0498-4055-8706-23a85b5c9bb0/25816857278.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/powera_xbox_one_wired_controller_not_working_on_pc.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_19855f5b6b6d4d3284adce05f095184b.pdf?index=trueIn PDF document text
    • http://sovuberexizizir.epizy.com/tallentex_2019_answer_key_28_oct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbeed83-4870-44cc-9343-669e0036c438/mibetasozi.pdfIn PDF document text
    • https://1bc2da55-d9f9-46f5-9d67-b48dc82c85d4.filesusr.com/ugd/957ce7_08a8ccac0100493996ff17dcc89145ca.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_fd07e0dce18247319b5a521d2ea3320d.pdf?index=trueIn PDF document text
    • http://sinodigewenewe.rf.gd/xixubaliremib.pdfIn PDF document text
    • http://nupikokaguzixag.rf.gd/genetics_download.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_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 5720 bytes
SHA-256: 0836555ca2a17df40b38ba042c23913b5174ec365e238eb616c32275594ac789
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 10348 bytes
SHA-256: ec8294ce481e32b00f26e150ae3563bb57f337c9f67fadb014e45a50a5707e31

Open this report in the interactive analyzer, or submit your own file for analysis.