Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8e11c9a3a69805…

MALICIOUS

PDF

101.3 KB Created: 2021-03-31 12:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fcf96e838b60897d172b719d51f5f32e SHA-1: 73df69b0e5ce3d73e20a87256a9e10e81b397a48 SHA-256: ac8e11c9a3a69805a85e42d8bd980223f3e0a642b5dec0f636eb7bcf4e2223ac
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is classified as malicious by ML and ClamAV. The document body, though obfuscated, suggests a lure related to a free agenda, which is a common tactic for phishing or malware delivery. The presence of numerous links to disposable hosting further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=agenda+2020+diaria+para+imprimir+pdf+gratis In PDF document text
    • http://mxbur.fun/singer_319_wz69wd.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/gusagib.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/9198117.pdfIn PDF document text
    • http://vuzideko.iblogger.org/international_accounting_standard_26.pdfIn PDF document text
    • http://arenda-comp.space/72879774583nbtqn.pdfIn PDF document text
    • http://soldonlakewood.com/cross_stitch_letter_generator_freexpd22.pdfIn PDF document text
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/5e1c1f374a.pdfIn PDF document text
    • http://rubeatyshop.xyz/vafiviku2q5u.pdfIn PDF document text
    • https://bazotopefinuz.weebly.com/uploads/1/3/4/4/134435952/sibakipufebovuxijo.pdfIn PDF document text
    • http://toreret.scienceontheweb.net/riesgos_laborales_fisicos.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/3605478184.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/b0d227fa-ac55-488b-8acd-b81a7a162c53/harry_potter_movie_5_runtime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b608e0-0bf0-48a3-8aeb-232a38914ecf/gmat_official_guide_quantitative_review_2021.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/leferekepumulelefej.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/kgf_chapter_1_telugu_audio_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d544bf9-9884-4edb-9e48-3f4755072740/list_of_books_by_orhan_pamuk.pdfIn PDF document text
    • http://sowumularuro.epizy.com/advocate_personality.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/did_congress_pass_the_affordable_care_act.pdfIn PDF document text
    • http://seninode.epizy.com/p8z68-v_pro_gen3_memory_compatibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d39b86-d218-4a28-a6ad-a902cf79d0b2/moxexuxizer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12799 3016 bytes
SHA-256: 8fe238d4efa118d1e805f072976fe3c461391de55fefcb4facfc8f71fb735506
font_01_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 5592 bytes
SHA-256: 103c6d1bb016db8a5edcced0acabae084924a5595c8d22c1b0b236a56c74c018
font_02_sfnt_off00014544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14544 14052 bytes
SHA-256: a811c4d884b50d0c0bea5c6ddaf5f4714d8692bb1bd23f09839e6ef45957eb91
font_03_sfnt_off00017069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17069 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e