Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fff3d2fd536220e…

MALICIOUS

PDF

82.6 KB Created: 2021-06-11 12:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1c6a0cf6b39c7e28afa4c908df8a8ea4 SHA-1: 66eb2ef1d7abd6b2f02ac17b725bc21c9bd4675f SHA-256: 3fff3d2fd536220ec1eb79600d350c8e16285882c73f525cc3845e94bb781782
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URL `https://crysiq.ru/pbw?utm_term=happy+birthday+fatima+status` is a primary indicator of this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=happy+birthday+fatima+status PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423429/normal_601b6cd60bbcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368489/normal_5fef88d6d2ba3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5fe87300b1c3b.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/matixibulofexuvefe.pdfIn PDF document text
    • https://gonibokufelari.weebly.com/uploads/1/3/5/3/135346176/zitemowexe.pdfIn PDF document text
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/7111196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_5fe704af562b5.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/320f450115d2435.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/xijikilizuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480402/normal_5ff52bab43086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fe03234bad09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444869/normal_5fe5debc2e740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445104/normal_6003dbabc9174.pdfIn PDF document text
    • https://gufunemoxopu.weebly.com/uploads/1/3/7/5/137507416/d5eafa.pdfIn PDF document text
    • https://rorenaziva.weebly.com/uploads/1/3/1/8/131871817/kuzejilumexuze-xufulur-bowebusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_60340279cd254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b50fb5a2-f499-46aa-96f4-5d4d047984cb/2k17_ppsspp_game_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14ee4140-c0f1-4659-9d59-e19539ba0c30/baby_g_ladies_watches_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f795ee-3ae2-4528-9558-2544eeca1335/outlook_web_app_forward_email_as_attachment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d4ee8d-0bb4-4a00-a854-75676e149a7c/esperanza_rising_chapter_summary_los_higos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 5000 bytes
SHA-256: c406cb4627f8be378eaea4ac40b8be76801efb33933ee1b1c330af2c4f54d809
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 10656 bytes
SHA-256: a466dc23def93a71a067c1c0289535d916f2d266cfe9ddbc87036c02a077b737
font_02_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 17112 bytes
SHA-256: f9dc15b9e7e1a45eeec377706f6e9859ce73b6054018bdf95ecdbdcfaa16ab0e
font_03_sfnt_off00012d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34