Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37ca36c547266c8…

MALICIOUS

PDF

67.8 KB Created: 2021-03-14 03:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 13d19448df049619243d6ce31098de1f SHA-1: a241b4e16dff148d23014aa556eb1c0bcccf10c3 SHA-256: b37ca36c547266c86e9978750814f1f4dd7691a9c6fe64b60a68410c0e3e4325
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=en+el+nombre+de+jesus+es+poder+acordes PDF link annotation
    • https://cdn.sqhk.co/gesokusa/3ChahiU/motorcycle_shop_near_me.pdfIn PDF document text
    • http://peramabejakes.sportsontheweb.net/7_catholic_social_teachings.pdfIn PDF document text
    • http://nizuloxodiza.iblogger.org/pilejogurunafikovuve.pdfIn PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/8c3cb137a93.pdfIn PDF document text
    • https://cdn.sqhk.co/wifuponi/ifjeiej/history_of_africa_bbc_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/idqjgcd/4_in_a_line_game_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/jjFDuhf/fruits_forest_rainbow_apple_mod_apk_download.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/6835829.pdfIn PDF document text
    • https://xibupofuku.weebly.com/uploads/1/3/5/3/135306475/motugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a2f584-8368-427e-aa60-336c0b01f86d/how_do_i_change_the_water_filter_on_a_kenmore_elite_refrigerator.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/amazon_fba_product_research.pdfIn PDF document text
    • http://sewevikefusox.epizy.com/53157016686.pdfIn PDF document text
    • http://renenubulasuf.rf.gd/vixax.pdfIn PDF document text
    • http://zijipowatik.epizy.com/firefox_for_linux_kali.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/toto_washlet_s550e_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc1fb65-b89f-4188-8a81-57602a072f3d/what_does_deterrent_mean_in_capital_punishment.pdfIn PDF document text
    • http://ravotosaxubepom.epizy.com/jandy_valve_parts_diagram.pdfIn PDF document text
    • http://livirava.atwebpages.com/how_to_turn_on_char-broil_grill.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_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 5392 bytes
SHA-256: 7a21394014c3f7e5f3ddacbf073f65f5d784b22523a331c32be674b306953cf2
font_01_sfnt_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 11236 bytes
SHA-256: c81f81e71e01eb77a4922e22bb87e52f626af810ed49d48fd0c4f0f7d633ba19

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