Malicious PDF — malware analysis report

Static analysis result for SHA-256 41811c02b4044634…

MALICIOUS

PDF

137.1 KB Created: 2021-05-08 23:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ce654e92148743cab77b658db0c24d96 SHA-1: 24c35d9302fea9ab8debcf201f20df43f41c4e5d SHA-256: 41811c02b4044634472bdb50951f13a2cdffc29060b01307d98dc41f24f7e780
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or use UTM parameters, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://nipisod.ru/strik?utm_term=que+significa+discernimiento+en+la+biblia+cristiana PDF link annotation
    • http://help-lnstagram-verifycopyrgiht.com/dobuzuwedirg.pdfIn PDF document text
    • https://nudijezomuxu.weebly.com/uploads/1/3/4/3/134377325/3077694.pdfIn PDF document text
    • http://nejufez.22web.org/89438757056.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/hhimusH/sizasozukerozejano.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/fhgigoG/zojoxif.pdfIn PDF document text
    • http://rodina38.ru/85696223770l24y6.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/ididiay/color_touch_effect_in_android_linearlayout.pdfIn PDF document text
    • http://phulop.store/how_to_replace_verizon_fios_remote_control29os8.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/602265.pdfIn PDF document text
    • http://viwumurowiwoba.22web.org/astasia_definicion.pdfIn PDF document text
    • http://submonster.xyz/hills_c_d_feline_feeding_guiden769h.pdfIn PDF document text
    • http://jilet1.club/multiplicacion_de_potencias_de_igual_base_ejemplosd6c1n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_6775e819e75645d5aec43b50a98baf0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/lg_f200s_4g_lte_hard_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/new_bangla_stylish_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/wanakir.pdfIn PDF document text
    • http://nipaxuwibaket.epizy.com/vocabulary_game_esl.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_bed48f01e4df4ff28e0906be0a736048.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_e1ba811be261459281295d6fb62040f6.pdf?index=trueIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_0307c65ea74f441a8187f1a5e68c2484.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/8th_grade_pre_algebra_worksheets.pdfIn PDF document text
    • http://relisedozoru.epizy.com/yao_anesthesia_8th_edition_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C34B 5544 bytes
SHA-256: 0e06b20eab2bff8477a16eed4752db3844a32da0fbe7979a9bed45bd2ea2f922
font_01_sfnt_off0001d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D613 12684 bytes
SHA-256: 70da9b351192750bac7f46994ab50041372cd027f6c16d81ba07493bccb69d53
font_02_sfnt_off0001fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEDE 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953