Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dbfc01632fdf72…

MALICIOUS

PDF

107.2 KB Created: 2021-04-01 09:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a664db2bfd0f1b7edc5f0cd31ac899ea SHA-1: 2f407e8f00e4918434159237681e08c5e15cca6a SHA-256: 22dbfc01632fdf721cb64932f9a21041cca38167561ab1af3fc19556050a3e29
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the document body, which appears to be a garbled attempt at SEO content, point towards an attack pattern focused on redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=what+is+the+meaning+of+audacity+of+hope PDF link annotation
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/896beb17d9ddb5.pdfIn PDF document text
    • http://jelenus.iblogger.org/what_are_outbreaks_epidemics_and_pandemics_worksheet.pdfIn PDF document text
    • https://turikiripejuz.weebly.com/uploads/1/3/4/5/134501804/biteduvatukovaluken.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/cophivE/28478774206.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/geieijb/fimopovikiweripiref.pdfIn PDF document text
    • https://cdn.sqhk.co/wowasuperan/gugejbn/regal_cinema_movie_showtimes_today.pdfIn PDF document text
    • https://jobavoxiduru.weebly.com/uploads/1/3/4/7/134722818/fikux.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/gg8yggd/1757404972.pdfIn PDF document text
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/ca896ecd15e6f01.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/QihgfQf/metal_soldier_titanium_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b5448c-9495-4833-ae0a-c78a53b8b57e/ikea_malm_single_bed_frame_white.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/kanolupoburanasunupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fb9ead-fdd9-4b69-80d9-72cc531817d8/electrical_engineering_salary_out_of_college.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/jusawojemofonajaderidan.pdfIn PDF document text
    • http://lidazadopedu.rf.gd/64657538725.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/mugoripodoguxitoditilevat.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/fsot_practice_test_answers.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 10056 bytes
SHA-256: 86848fc340bf78b02c0e8044ff4b0b40d2b472dc1e8b0e48d3c5923db9c7fdcb
font_01_sfnt_off000129f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F2 5556 bytes
SHA-256: 85aabcc82a0ed949ed16692069d51a13181d3ab6677ad842553870a3a0ba4d3b
font_02_sfnt_off00013ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCF 3148 bytes
SHA-256: 51238bfbe0bda511d0b76fa4da72257ac31bdb09646ac22e608d3ccf30e42c12
font_03_sfnt_off00014949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14949 24232 bytes
SHA-256: 1e987eca1253461168641c3b60b3e1101f44c10664a113ab442ea34e3b33f3bd
font_04_sfnt_off00018622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18622 16924 bytes
SHA-256: fc471f4a9485425ddf2f043542d45f05448e374160e7bbd3a03c3099ea6a513d