Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a912bf9b87a9aa…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 07:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f9079163e84213818c351b9015763a8 SHA-1: 70ea8c024f44d1252f5caa737e6034f75ef9aba7 SHA-256: 56a912bf9b87a9aaed9340ec1ed6aa69517e5928d545627473b426c70ed7e84f
186 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 0.9964

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://gimoguvi.ru/wix?keyword=chemistry+final+exam+answers+2015+ap PDF link annotation
    • https://cdn.sqhk.co/bidomutarili/4Ijehfq/velodrome_bike_swap_meet.pdfIn PDF document text
    • http://ylyn.ru/61426143192cpl37.pdfIn PDF document text
    • http://acgmgroup.ru/xoramubamebagio5206.pdfIn PDF document text
    • http://topsalon.xyz/proshop_led_par_64_manualr6nq7.pdfIn PDF document text
    • http://helplnstagram-confirm.com/dotugojeki734ut.pdfIn PDF document text
    • https://ludiwutigavas.weebly.com/uploads/1/3/4/6/134697468/7143177.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/2636791.pdfIn PDF document text
    • http://parkingtest.xyz/honda_eu6500_eu6500is_generator_service_repair_shop_manualn8e2x.pdfIn PDF document text
    • https://fawimerena.weebly.com/uploads/1/3/4/6/134630635/nosiwerolinuj.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/ghkjaTO/92377856402.pdfIn PDF document text
    • http://sedouche.xyz/how_to_troubleshoot_a_furnace_high_limit_switch2ctc3.pdfIn PDF document text
    • http://liketime.fun/who_are_socially_disadvantaged_groups_in_indian_societyiuz29.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/c96ab3d6.pdfIn PDF document text
    • https://zifimebitumane.weebly.com/uploads/1/3/4/2/134236425/palitaginixu.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/gcgI62P/sonny_and_cher_songs_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/hbhf0ge/mozusapi.pdfIn PDF document text
    • http://gidpopiteru.com/disability_support_pension_rates_2019_australiapuwl4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_5434472a3f5d40cab7f729fbedf63bde.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_bf5bd4488e684b4782331c74866d77fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/16920516698.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_e756361116984bc08ff46df185846c94.pdf?index=trueIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_2ffab5febe00439fb40f91fc61b0729d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widiku/lamiwekakaxadosarigemered.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/mosejexosewamobita.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/2015_challenger_srt_performance_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/college_admission_form_2019_mdu.pdfIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_a7e81ffe59b34b6c8bc7a0a08517c3c1.pdf?index=trueIn 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_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 5760 bytes
SHA-256: 120502b0201623745b999ba244cb75738e772d1e7612db79accc18891d677af1
font_01_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 10688 bytes
SHA-256: 28545949641db952dd8a1c9f78e1830071b1960a03da2f2a020021b8a0f413b9