Malicious PDF — malware analysis report

Static analysis result for SHA-256 39949c98d4c8448c…

MALICIOUS

PDF

78.5 KB Created: 2021-02-20 06:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cc63762463dde29de87a868c7c588ea4 SHA-1: 65c5ae79809b5b1dbec6a4bdc36358d30c036b40 SHA-256: 39949c98d4c8448c345a0085e28b9d13fa23bbe60c20ba95d645266736e26fbd
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the presence of a URL like 'https://bologen.ru/wb?keyword=dyna%20glo%20rmc%2055r7b%20manual' suggests a lure to a site that may host malware or phishing content. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wb?keyword=dyna%20glo%20rmc%2055r7b%20manual PDF link annotation
    • https://timigotevawil.weebly.com/uploads/1/3/5/3/135329967/9084658.pdfIn PDF document text
    • http://xtina.online/countless_or_open_scenes_for_theatreutw8a.pdfIn PDF document text
    • http://igafnd.org/perfect_violin_sheet_music_musescore2lkty.pdfIn PDF document text
    • https://falototadapi.weebly.com/uploads/1/3/3/9/133989324/7080571.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/32102322829zgupq.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/busumabipikipo.pdfIn PDF document text
    • http://devlp.club/cristianismo_puro_simplesz4tt7.pdfIn PDF document text
    • http://xejebowipuzusim.iblogger.org/paguxeromus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumomevafuvozup.rf.gd/tamilrockers_telugu_movies_tamil_dubbed_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/airdroid_premium_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/oxford_advanced_learner_s_dictionarydrive.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/c_s_k_video.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/codycross_answers_group_201_puzzle_3.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/practice_worksheet_graphing_quadratic_functions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/zalawegalasifitoposagijum.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/clothing_manufacturer_company_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/piwanupibemagajipuxatobi.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/boss_bengali_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/14104073431.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 5388 bytes
SHA-256: 5029a2778e34b3efe92e6035d3f188d2e1108fd650465f67522188a141c9eb8c
font_01_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 11612 bytes
SHA-256: adc60d1eb34ef6bf33d153d0db0ba1b4ee5e7d242c8e9d9414f1c04a5d51b8f0

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