Malicious PDF — malware analysis report

Static analysis result for SHA-256 791a5375da2d008c…

MALICIOUS

PDF

80.3 KB Created: 2021-03-22 00:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 060013869be1b7a2cf54a27f21f0e758 SHA-1: f252127c6c11b359da712fe7a72733e7a4276123 SHA-256: 791a5375da2d008c3def24ff1c147800179dcd752bee0be72421811774f2d8a5
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of external links, many pointing to disposable hosting, characteristic of a link farm or SEO spam. The 'SE_CLICKFIX' heuristic indicates the document attempts to trick the user into running a command, likely to bypass macro restrictions and execute a payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://golowaki.ru/wix?keyword=hdfull+tv+apk+2019 PDF link annotation
    • https://cdn.sqhk.co/kezixowog/djcgitg/iowa_high_school_all_star_soccer_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/hePkeqm/witivak.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/HHgijcI/gelobojobo.pdfIn PDF document text
    • https://jowifovisafalo.weebly.com/uploads/1/3/4/6/134673378/3018935.pdfIn PDF document text
    • https://cdn.sqhk.co/dagidomu/ciahchc/swope_soccer_rainout.pdfIn PDF document text
    • https://cdn.sqhk.co/zosuvito/d5UMib2/brittany_perille_glute_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/jbZigha/tsuki_adventure_forest.pdfIn PDF document text
    • http://gepatoxax.iblogger.org/quran_translation_in_english_with_arabic_text.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/634222.pdfIn PDF document text
    • https://kajilavenusifo.weebly.com/uploads/1/3/2/6/132683330/dizuvukufowo.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/bFhb4je/xeziwuxoxomarogimapelam.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/hpuHhgQ/11747756807.pdfIn PDF document text
    • http://megivisu.22web.org/97762716752.pdfIn PDF document text
    • https://dugubutufafug.weebly.com/uploads/1/3/0/7/130775350/nitisaverox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/50616078-a0d9-4c2a-b8bf-6b5b268843a8/naxewotefinobike.pdfIn PDF document text
    • http://joxumokuri.epizy.com/potarivetilajakupurokuv.pdfIn PDF document text
    • http://fewuzefar.rf.gd/88722275168.pdfIn PDF document text
    • http://lebekuwawelu.epizy.com/chromium_vs_google_chrome_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7dc0e65-11b5-41de-9086-8d6443631411/my_passport_wireless_ssd_2tb.pdfIn PDF document text
    • http://xuminigodadiveg.rf.gd/xisivuvalibaxipawoj.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 5328 bytes
SHA-256: 5c8cc02d27521ce48630f4511ffe12a6f2721fd036b1a3964021a6e1e5921175
font_02_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 11476 bytes
SHA-256: 3d4d8c7f72e441a79aaf4daeb7a43dddaf337bd3c89ab29363e2522bad2dae5d