Malicious PDF — malware analysis report

Static analysis result for SHA-256 5519bfcb69efe9bd…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 13:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bb96f80375d733651a21785464c9146d SHA-1: c7eca4edcdce17877272a215a3a20073326cd25c SHA-256: 5519bfcb69efe9bdadcc1ccfd78f86219ccf7c6d5637dff01e84ce74bfbac95d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=stihl+wood+boss+024+av+parts+diagram PDF link annotation
    • http://piwulefimer.22web.org/free_printable_contraction_worksheets_third_grade.pdfIn PDF document text
    • https://rigozogukex.weebly.com/uploads/1/3/3/9/133986215/9716468.pdfIn PDF document text
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/5777563.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/a0569.pdfIn PDF document text
    • http://golivexi.22web.org/edge_of_the_empire_character_sheet_generator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaxemazetoralib.rf.gd/procreate_drawing_tutorial_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/how_to_turn_off_panasonic_answering_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/disunefuxalojamu.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/how_does_a_manual_pole_saw_work.pdfIn PDF document text
    • http://fokekamunedas.epizy.com/41256467432.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/cvs_wrist_blood_pressure_monitor_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/how_to_activate_adt_motion_sensor.pdfIn PDF document text
    • http://kepemusodokiwif.rf.gd/purolavasuwexonifaguva.pdfIn PDF document text
    • http://xuxegukazo.rf.gd/a_muralha_da_china_kafka.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/dozaparepotegeze.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/wakudajezutedid.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/jepefa.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/vufuwokom.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_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 6128 bytes
SHA-256: 221ceca9fa521c1ac55bdd4bbbf7e9edba5a6240620dea3bc59e8afc912a8058
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 10832 bytes
SHA-256: 22544bd3400107334868004e59ec4459b435d1baeb37dead751edf250d597f53

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