Malicious PDF — malware analysis report

Static analysis result for SHA-256 af915daf91c28aaa…

MALICIOUS

PDF

86.3 KB Created: 2021-03-11 22:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 09df8a42ffc1c22e4d2d5745236aafd8 SHA-1: 2467202dc07a5600c05c164dd46a19c5ca35e409 SHA-256: af915daf91c28aaa16a28da117b3880057ef561d8b628ed9f64b872808a0a700
184 Risk Score

Malware Insights

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

The PDF contains embedded links to malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to an 'Australian slang dictionary pdf'. The presence of multiple embedded URLs and the ML classifier's high confidence score further support a malicious intent, likely for phishing or to download further payloads.

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/award?keyword=australian+slang+dictionary+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404983/normal_5fc73c2092607.pdfIn PDF document text
    • http://interbank.link/how_to_change_my_motorola_router_passwordz88ub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_603b6ea9f2aab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_604325316feab.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/haLghaJ/bigil_verithanam_song_ringtone_isaimini.pdfIn PDF document text
    • http://goodsfor.life/vataxofus87oc.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/iESWMzT/bilatuliraligesef.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/hWjdha4/content_transfer_encoding_html_email.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5ff1eda1ce54d.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/jbxhi0P/jitizit.pdfIn PDF document text
    • http://carishr.com/the_maze_runner_1_full_movie_in_hindi_download_480p_filmywapu006w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_6037a1fc3d6d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_601d17bd7b4e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_60285a4034325.pdfIn PDF document text
    • http://de-bewertung-889562.icu/wow_classic_warlock_leveling_guide_1-_60f2imh.pdfIn PDF document text
    • http://ueuniti.xyz/rufezopodisejekifogezez27w2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fapaga/23363674723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c2bc13-e431-4573-bac2-5f8f92adfac4/rokubosuxofokumaraguxal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/068eddfb-1158-4b7b-8457-84ba505a3aa6/garudorubajoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06053e50-220e-4655-aa24-f1028c2cd307/ever_be_on_my_lips_chords_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/complex_sentence_worksheet_9th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617e285f-fb8c-49b0-9e5e-220b4e60814c/what_is_magna_carta_law.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/strangers_on_a_train_movie_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/infantino_flip_advanced_4-in-1_convertible_carrier_how_to_use.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 5180 bytes
SHA-256: eaa17b3d2e8feac9eb2080841c70451b15be4af3695b48b153a9ae4a6235eb4f
font_01_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 10812 bytes
SHA-256: 5e3e95d12c89b072338a739d335300c44b6c987d74ebf0902e9f7f1fbe258758
font_02_sfnt_off00013dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333