Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d30ab70b978b71…

MALICIOUS

PDF

80.1 KB Created: 2021-03-03 18:10:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: db6825274c91f549dae265d12e2a6d06 SHA-1: b05716817f771c2d01b37f061b5d6731834c6df8 SHA-256: c8d30ab70b978b7196876757bd705a37f27054f975962e669da047f2b0abb868
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 0.9998

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://kuzutuzo.ru/123?utm_term=2007+jeep+grand+cherokee+laredo+electrical+problems PDF link annotation
    • http://fipizilemuwob.medianewsonline.com/76486451963.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/iggj05u/extreme_jet_ski_rental.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/gc3A4ji/medasuzol.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/ccvvheB/22293317926.pdfIn PDF document text
    • http://rowejabajusape.22web.org/how_do_you_put_on_the_helmet_of_salvation.pdfIn PDF document text
    • https://sapuzexa.weebly.com/uploads/1/3/5/3/135348006/a0b637d1a9626e.pdfIn PDF document text
    • http://zexawil.22web.org/41426412904.pdfIn PDF document text
    • https://cdn.sqhk.co/nafumozuwe/gH1iigg/photo_lab_picture_editor_free_download.pdfIn PDF document text
    • https://dukupifit.weebly.com/uploads/1/3/0/7/130775427/537380.pdfIn PDF document text
    • http://mozakotefeg.22web.org/windows_10_os_download_for_pc_32_bit_free_full_version.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/lexus_ls_460_specs_2008.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/daily_words_app.pdfIn PDF document text
    • https://cdn.sqhk.co/feziwetesene/hcaIajj/ultimate_football_heroes_collection_10_books_set.pdfIn PDF document text
    • https://fixabewol.weebly.com/uploads/1/3/4/7/134711766/2571490.pdfIn PDF document text
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/koxuliran.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://danokob.epizy.com/3d_tuning_pro_mod_apk.pdfIn PDF document text
    • http://muxajetolalet.epizy.com/hua_bechain_pehli_baar_song_320kbps.pdfIn PDF document text
    • http://fetufebutegiv.rf.gd/bufupi.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_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 6024 bytes
SHA-256: f17431dd8ed0f7f15a395cad37a7d6c8ebf531b4f304aabbdfb5ef2522cd7c8d
font_01_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 9892 bytes
SHA-256: 006ad0da2df1a52e4914fb5e3987070f34bf95bcad049089ac35769bbf9ae529

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