Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ffccc8bb85a674…

MALICIOUS

PDF

110.8 KB Created: 2021-04-10 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 285f5d252b94b7694404888553c44f81 SHA-1: e3fdd7be448e60c7cd3dbbfce2ebee5fb07345be SHA-256: 42ffccc8bb85a674a9da99dbda0164b6d709d690f76bf26d252d34b06b38638a
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to suspicious or known malicious domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains strings that appear to be search terms, further supporting the lure-based attack pattern.

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
  • 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 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://dafemum.ru/strik?utm_term=amplificador+fender+princeton+chorus+2x10 In PDF document text
    • https://cdn.sqhk.co/mewuxedodi/yvLgfhj/wazadozevo.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/punjabi_boliyan_jagoseu20.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/d6df6e1526.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/Hgj7ihD/ladagarakiza.pdfIn PDF document text
    • http://creditpm.com/who_is_kane_and_abel_based_ongaptf.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/CichgeP/moram.pdfIn PDF document text
    • https://dowazulipogopu.weebly.com/uploads/1/3/4/3/134322731/xoforufi.pdfIn PDF document text
    • http://slmit.fun/blood_gas_analysis_normal_rangerecpv.pdfIn PDF document text
    • https://cdn.sqhk.co/bavomizobe/Jgfgdhc/african_hair_braiding_salon_houston_texas.pdfIn PDF document text
    • http://hdvideo.design/gozamisixugix7l6rt.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/XCKibb9/zamovovogadiwebusiteju.pdfIn PDF document text
    • http://fofesivolu.iblogger.org/examen_ser_bachiller_2020_junio.pdfIn PDF document text
    • http://amin-ukraine.net/51758976366gt030.pdfIn PDF document text
    • http://bokulidedasez.22web.org/webarchive_to_online.pdfIn PDF document text
    • https://basuxebuj.weebly.com/uploads/1/3/1/3/131379820/nisames.pdfIn PDF document text
    • http://mugeziv.22web.org/amino_acid_chemistry.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/pugomonapoxuxe/new_hollywood_full_movie_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7797786b-0351-4ea2-bc14-7abb2ec9f6b5/pubad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84b17bb-6682-4987-b40a-3dc2a0651599/god_emperor_of_dune_miniseries.pdfIn PDF document text
    • http://pavipalu.epizy.com/glidden_paint_reviews_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/gebafukinozeladolivujer.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/worksheet_use_of_among_and_between.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8bae5b-1acb-46ac-ab13-c62407f1f99d/onkyo_tx-nr709_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/most_comfortable_sleeper_sofa_2018_consumer_reports.pdfIn PDF document text
    • http://dupubavamuwoxaz.rf.gd/bubble_sorting_in_data_structure.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_off00016dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DEC 5780 bytes
SHA-256: 7f13bdff2fca7a4fabd70943be505ba54090da53339dc7fb8087e857e6d8b780
font_01_sfnt_off00018173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18173 13236 bytes
SHA-256: 7ae6c549cb73d4d9ee86c795a7f035d0cabae31dde9b3b9d2876433202d38c1f