Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c8d92efaec8f54…

MALICIOUS

PDF

76.5 KB Created: 2021-02-16 11:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2407571dba0bb196dd7749622bd6cc3e SHA-1: 32b88a4d0770747112a6c0135c74d92a875cf9ef SHA-256: 81c8d92efaec8f5441faa8086353bc1b1611620d708ad3c9a029db20d09cef9f
244 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely serves as a phishing or SEO spam lure. It contains a large number of embedded links pointing to various external websites, including a known malicious redirector. The document's content is heavily obfuscated, but the presence of numerous links suggests an attempt to drive traffic to potentially harmful sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=the%20external%20auditors%20might%20consider%20the%20procedures%20performed%20by%20the%20internal%20auditors%20because In PDF document text
    • https://vavunoruluso.weebly.com/uploads/1/3/1/0/131070491/badigirimamo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5fff6fb2679a2.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/jiieieV/75339088359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_6013f242106c4.pdfIn PDF document text
    • https://wedarudojov.weebly.com/uploads/1/3/4/0/134012757/bcb15912da.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/jfjgZld/topup_digi_pin.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/gcXidss/voice_changer_sound_like_a_girl.pdfIn PDF document text
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/mezixezamifovaf_lolifo_lawunamaluva_lipesaduseji.pdfIn PDF document text
    • https://pidakulosa.weebly.com/uploads/1/3/4/3/134391257/kutoz.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/Z8icHii/social_dev_story_2._1._8_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/DPidMCj/ps5_hd_camera_specs.pdfIn PDF document text
    • https://paxuxitusokewu.weebly.com/uploads/1/3/1/3/131380341/420826.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/giia9MG/black_bream_fish_taste.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/sebufu_mebabijajaweral_nafepuwek_bibal.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/iaPtVtZ/big_notorious_music_greatest_hits_album_download.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/FhdyhcB/sulaxigivepenigenimepa.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/PCgjYtH/forest_wallpapers_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fc87a4a78840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowelipap.epizy.com/38695309959.pdfIn PDF document text
    • http://kezuxitejapub.epizy.com/addition_worksheets_for_2nd_class.pdfIn PDF document text
    • http://wukazenavezexeg.rf.gd/attenuation_coefficient_waveguide.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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 5828 bytes
SHA-256: f8e495b254ed238b7f970e1c11247f534502863d75d98542899b92ffa0d646db
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 10484 bytes
SHA-256: 9caf289de5e3f6860d5b1e194921cb7e51ab276f318b2a5e338a3973b544f396