Malicious PDF — malware analysis report

Static analysis result for SHA-256 2883b7baf454faa4…

MALICIOUS

PDF

111.8 KB Created: 2021-03-28 04:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba545985aed17eac134f4dc384febcc4 SHA-1: 39de585fde7be63e1102e00199ba84ff7ddcc777 SHA-256: 2883b7baf454faa466cbab1a561b5a98cb2d2ca85a499005f42c65cb35931ec7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=assignment+abroad+times+pdf+download+today
    • http://godotobekof.scienceontheweb.net/kenmore_300_series_washer_lid_switch_bypass.pdf
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/0f07ae8cb.pdf
    • http://vikorurapufor.iblogger.org/ultrasound_guided_caudal_epidural_steroid_injection.pdf
    • https://cdn.sqhk.co/gidenateg/hjgjgc6/21596814181.pdf
    • http://kedugobepuged.mywebcommunity.org/47737154490.pdf
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/kokidomakuxudi.pdf
    • https://cdn.sqhk.co/dijobika/6jjjgid/juxarilugitadutorafip.pdf
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/xaxepusetodijomu.pdf
    • http://viputixezererej.66ghz.com/lofopevoguxetojegidigu.pdf
    • https://cdn.sqhk.co/sugezigo/gixijhb/action_movie_trivia_with_answers.pdf
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/tikobavufij-gesumiwew-batavuwosaf.pdf
    • https://cdn.sqhk.co/xesofosirija/XJigAZa/calendario_liturgico_romano_2019.pdf
    • https://cdn.sqhk.co/tobizopowebo/4CSjfXi/busybox_for_android_2._2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://nitaxukim.epizy.com/rolobudozogefexenidukog.pdf
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_7d6aa356e89f491396fd7d651ef3e4e2.pdf?index=true
    • http://nakepusejedub.epizy.com/new_afib_guidelines_summary.pdf
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_abdc430e74544f64a870f954b5663322.pdf?index=true
    • http://zaramapowo.rf.gd/70601062903.pdf
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_9bdb3abb9d7b4c06ba991441b99b40df.pdf?index=true
    • http://kuniwivazusas.epizy.com/20231995136.pdf
    • http://gotapomoleza.epizy.com/artificial_intelligence_report_2020.pdf
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_4d674253d7ef4a5aab50727fc097e28c.pdf?index=true
    • http://vepetisex.epizy.com/apgar_score_chart.pdf
    • http://saxogif.epizy.com/igneous_rocks_lesson_2_answers.pdf
    • http://dusetelonuzaj.epizy.com/vmware_esxi_5._5_crack.pdf
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_e4922fefc2574b04bcc5987e72c94997.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015992.bin
44e4a5ea88414b2dac1f5a065596ce88092524b07d4ade0e9743a4edc58d4040		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15992 5684 bytes
font_01_sfnt_off00016cd7.bin
e42ea543d1ebe529a023065d74575a21ffb8c8f4c4bba77f2aca14d985d1017c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD7 3580 bytes
font_02_sfnt_off000179b4.bin
9a77fc8712c1d9c72b0a9b67bade1578dd6fc334f1c9eb14b25ae6036fb0463b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179B4 10520 bytes
font_03_sfnt_off00019dc0.bin
8d31ee0ca61fcf0e4424a4dd16a2d714ae7a5f9e7f7cd757ea5d60f90a0a1a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19DC0 5140 bytes

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