Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc50cb9fa4251a9…

MALICIOUS

PDF

81.5 KB Created: 2021-04-26 20:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 3eaa8203da9018bc1874299e3933989e SHA-1: 878d0803d02bc2c5d9f1e6c4e2cc480fe2dad6ed SHA-256: 2cc50cb9fa4251a9fdf28b6bdf69e2afa90eac61417a3939c0e977305835735d
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to PDF files, indicating a phishing or SEO spam campaign. The heuristic PDF_SEO_LINK_FARM and ClamAV detection strongly suggest malicious intent. The embedded URL and the document body, which appears to be garbled but contains a search query, further support the lure of a link farm.

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
  • 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.
  • 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://druttle.ru/strik?utm_term=what+oil+filter+does+a+2008+ford+escape+use PDF link annotation
    • https://sipesavuw.weebly.com/uploads/1/3/4/6/134697333/zuwurovasuw-zowab-rezibubododiso.pdfIn PDF document text
    • http://delaem-sami.online/315257117798ifn6.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/kidif.pdfIn PDF document text
    • https://fozufamegevavup.weebly.com/uploads/1/3/4/5/134586639/473089.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://kufagexuwinu.22web.org/corporate_social_responsibility_towards_environment_in_india.pdfIn PDF document text
    • http://organicnu.info/3859894918ic0vk.pdfIn PDF document text
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/2355649.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/sunate.pdfIn PDF document text
    • http://todayshop.website/ruzadofubivukimuramamexistbv5g.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
    • http://palalujopaxuv.epizy.com/21541863106.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/purevpn_premium_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/air_force_ones_white_womens_size_8.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/vikofafuzuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/naskah_drama_ashabul_kahfi.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/anandam_malayalam_movie_hd_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/dewalt_18v_cordless_circular_saw_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/the_last_time_we_say_goodbye_synopsis.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/please_elaborate_your_answer_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/rerelokozarurawiv.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/bizisamoxojorubes.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/percy_jackson_and_the_last_olympian.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/casio_cgp_700bk.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/college_admission_form_2019_mdu.pdfIn PDF document text
    • http://denefarow.rf.gd/short_story_learn_english.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_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 5500 bytes
SHA-256: 5a60dc7de7c5fb0b386c253f64b9bfb7dfae978d21afadd1523d07ceed00a24d
font_01_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 10264 bytes
SHA-256: 039bfe78128df702155453abd15e5655261e8a1eb0c10bf2b99c8cd2e1906b3d
font_02_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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