Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d8a1ca89aca0cb…

MALICIOUS

PDF

76.4 KB Created: 2021-03-16 13:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24a64e2e46398d09bebef36d00fe6a2e SHA-1: c2078df1b6c5c49d2e50e2a7654809b0b092d24b SHA-256: 87d8a1ca89aca0cba7ad4e5a00234901023174d263b937437f2e31ac4b790073
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, which can be used to generate PDFs from web content, further supporting the idea that the PDF is a lure for external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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/strik?utm_term=cuantos+galones+de+agua+tiene+un+metro+cuadrado PDF link annotation
    • https://cdn.sqhk.co/sepexapubu/jaAgd4I/art_brush_normal_font.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/christmas_song_lyrics_jingle_bell_rock.pdfIn PDF document text
    • http://natur-bio.space/jopoliligezuqtdkn.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/ecfa74d73409.pdfIn PDF document text
    • http://olivamebel.com/82378014111drunc.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/Tjcigjj/63327801686.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/465njjf/escape_from_alcatraz_swim_times.pdfIn PDF document text
    • https://cdn.sqhk.co/tagubutapa/fijjcjg/stalker_mobile_game.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/adobe_acrobat_writer_price.pdfIn PDF document text
    • https://sudomudes.weebly.com/uploads/1/3/0/8/130874284/4602752.pdfIn PDF document text
    • http://lorubuxetorifa.medianewsonline.com/7_spiritual_laws_of_success.pdfIn PDF document text
    • http://bettermoneytips.com/kixusqpyoa.pdfIn PDF document text
    • https://kenoduzuran.weebly.com/uploads/1/3/5/3/135350653/kitevagawutuj-japab-julep.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/2ec0f22e1eeaa9b.pdfIn PDF document text
    • https://pisusexozidi.weebly.com/uploads/1/3/4/7/134740488/guvinipibev.pdfIn PDF document text
    • http://tb-films.ru/zulajotowunalumalaxeuj8s2.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/bChjicC/black_widow_trailer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goneduzum/64869781962.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_97135cae03024e18b0c91efe6cdecf0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/muvosijewirowane.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_c1c63502bf61487799ec30652a728c4c.pdf?index=trueIn PDF document text
    • http://pojozija.onlinewebshop.net/how_to_connect_behringer_x32_to_computer.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_349ae8f25e174e52ae279783745be5e3.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_c14d0e5903fc492ebd39d88b892cd472.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatisake/omega_remote_start_not_working_nissan_altima.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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 5164 bytes
SHA-256: b856420f509563cc65b88d16bc29b1dd127686972cf456cc30c8743808691d67
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 12124 bytes
SHA-256: 3bc60a9c0ae0df0a5d77b4826a865f5eea52152bcea7216dde6fdad494611fc6