Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7591b618c878de…

MALICIOUS

PDF

82.2 KB Created: 2021-02-03 23:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f720ed3d5482f9aeec9c868221cf6ca SHA-1: e97a5abe3155cba912fc9a8d51d1e212c7a80553 SHA-256: 5b7591b618c878de939968f34033d468409ac5a3851813e7cac79065610ebefc
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and redirector services, strongly suggests a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=kiski+area+high+school+football In PDF document text
    • https://cdn.sqhk.co/gukugifixija/igjjcii/7320307681.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/nixujixowipef_sitikej_tarejedeg.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/vhgKiAH/calendar_2020_live_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/fhgheha/cannondale_x_trail_7.pdfIn PDF document text
    • http://seedcraft.online/munajobobanerazoo2g2x.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/2099749.pdfIn PDF document text
    • https://fikejibin.weebly.com/uploads/1/3/4/3/134331262/7871135.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/gjijbjh/98031854686.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/2641655.pdfIn PDF document text
    • http://lasns.fun/570456825839t3mt.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hggggiL/64919046083.pdfIn PDF document text
    • https://masevaru.weebly.com/uploads/1/3/5/3/135346062/zodasotajogezi.pdfIn PDF document text
    • http://pochta-24.cc/vifemutepomogelin4k5s3.pdfIn PDF document text
    • https://mevimozow.weebly.com/uploads/1/3/0/7/130776561/272578.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/c4sgfpD/67993244753.pdfIn PDF document text
    • http://segway-wheelchair.ru/luzalawefc634.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/9YJcih3/homeplace_furniture_outlet_hubbard_or.pdfIn PDF document text
    • https://cdn.sqhk.co/luwukamuku/kgKJifI/rainbowenglish_2___2.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/bakekakag_zakumobekax_xanazofunaseli_wunuj.pdfIn PDF document text
    • https://lujiwosibe.weebly.com/uploads/1/3/4/0/134040634/8081371.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/modogiza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lunojol/joruzaziguzimemuvab.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/gajipifufoxebe.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/bullous_pemphigoid.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/71979771215.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 4996 bytes
SHA-256: 0759afa2bfcf2817d8c76114047a93de72fb1a649876868c303612a38c40b770
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 6068 bytes
SHA-256: 1f79b081fe245cf9181f2e6ad484d5de3f355e0828dbe7aa1c14a68e096e11b6
font_02_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 10800 bytes
SHA-256: 39d6cafdbb91de7b2736467b0de52f5d50b72bc1b086b406dee770adb3f2932f
font_03_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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