Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38664377df80f88…

MALICIOUS

PDF

104.2 KB Created: 2021-04-11 05:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 34af65f745e71cb1dd7b1cce4447e701 SHA-1: 813fd1f195b8ad035dac19ca9c012c7d6c1cf20e SHA-256: c38664377df80f887a648b5916f1e623baa74f86ae12514e3727a4795c61dc2e
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 0.9995

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://baarspo.ru/strik?utm_term=were+spartans+the+best+warriors PDF link annotation
    • https://cdn.sqhk.co/vutenugade/Oihjbha/wakofebekid.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/8ricapj/204159109.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/jihekDZ/19816787147.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/cfMhchi/deer_hunter_2018_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/dihwhem/ghost_files_2_memory_of_a_crime_nl.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/elXid74/6317578575.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/aijidop/piano_man_harmonica_tabs_complete.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/sYjchbI/jafajudowewoludijibefek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesaforasipu.epizy.com/kaspersky_antivirus_free_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/creature_3d_2014_full_movie_720p.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_5e7dba86453f41d0a1cc52626a4e1432.pdf?index=trueIn PDF document text
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_5f34aaa05ba74d21b387df82acfed540.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a5fc9a-d433-4dda-9d88-cd3e629c628c/danby_8_000_btu_portable_air_conditioner_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/44857546333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeacbc55-c609-4908-b3ec-0f42345db937/75074902394.pdfIn PDF document text
    • http://tofezigiserix.rf.gd/bigosededig.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/livenol.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_fd262a25ae3d44f69611fdab1a673fae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/38216774105.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/tafupoxanorinokefa.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_f7da2543e9c247a0a218cd33b393954b.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_8b86570b83274cdb821b29ab38746f2b.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_off00014fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE9 5120 bytes
SHA-256: 1176db71cb391c4a89689c897678f6524c4016e183b1823639248b09a61501e2
font_01_sfnt_off00016162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16162 17084 bytes
SHA-256: 6444477e0487aa4dadcba19c3c480bc3da30e5811a5d1ed7508a5e33226e253b