Malicious PDF — malware analysis report

Static analysis result for SHA-256 5937e39b5f291a92…

MALICIOUS

PDF

71.3 KB Created: 2021-02-07 12:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: dd46090ca5b309ee3494da79a20a7b2d SHA-1: 8f98777ae10936e1fc851af4f4a6d631e51d2a2b SHA-256: 5937e39b5f291a926f34483d60cdd22d771c525ce21e9e7e1aeeb12388bf16c4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or phish for information. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text suggesting it is an 'Android module example', likely a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=android+module+example PDF link annotation
    • https://cdn.sqhk.co/nadokikado/ht3jgm5/60391862626.pdfIn PDF document text
    • https://cdn.sqhk.co/guxifunuris/oNjejbO/deer_hunter_2018_hack_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/fjgiamY/zigzagoon_galarian_shiny.pdfIn PDF document text
    • https://rinizazekuke.weebly.com/uploads/1/3/4/0/134012784/deca1f9.pdfIn PDF document text
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/fulerobe_jarejigub_fivoner_wibefuturugan.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/hYwBgck/tufonewobip.pdfIn PDF document text
    • http://datulosuwila.iblogger.org/free_rap_hip_hop_albums.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/dLgdxji/beautyrest_drifton_plush_mattress.pdfIn PDF document text
    • https://cdn.sqhk.co/tapuvimixaxo/djacJhj/infinity_sign_tattoo_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/qGLxYhe/3d_puzzle_harry_potter_hogwarts.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/ds2owd4/kerezifuk.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/9215869.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/hajdhg3/cut_the_rope_2_download_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiguvazigavis.epizy.com/coloplast_skin_barrier_protective_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/automobilista_indycar_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/15953718268.pdfIn PDF document text
    • http://xovimed.rf.gd/7947986841.pdfIn PDF document text
    • http://kiralemosokeze.epizy.com/a_night_out_form_2_theme.pdfIn PDF document text
    • http://tidovikuvam.epizy.com/85205298773.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/rehabilitacja_po_endoprotezoplastyce_stawu_biodrowego.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/fenelodologipebamunitu.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_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 4984 bytes
SHA-256: 218f649798c23b437849cd89c710ff7bcef4ba76c0973539f17b29b5593a84dc
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 10448 bytes
SHA-256: 9fa8414f192f45794feec45f1030b8d6a8f9c002d9445639a50a75152d9dcbb3

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