Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d059e9d6dca9c7…

MALICIOUS

PDF

74.8 KB Created: 2021-02-16 04:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 956a4a7b60880e1a72d963c70c0071e8 SHA-1: ea52a0a0c2d238ea910d232ec87c52a0ad5713c7 SHA-256: 92d059e9d6dca9c7775b9d25d1cc9742a44de07ca8e457874208e368cfeb9521
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and an embedded URI pointing to 'jottigo.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to updating Samsung software, which is likely a lure to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/123?utm_term=how+can+i+update+my+samsung+j1+software PDF link annotation
    • https://cdn.sqhk.co/vujuzira/SRhdjjA/32869878188.pdfIn PDF document text
    • https://fexipipovunozem.weebly.com/uploads/1/3/2/6/132682859/wuxex.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/hbkjijc/goalie_hockey_bags_with_wheels_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/jj4lR1y/great_little_war_game_1_mod_apk.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
    • https://s3.amazonaws.com/luborinizu/bagagafunoretebesalepe.pdfIn PDF document text
    • http://xejarejunap.rf.gd/emerald_green_arborvitae_care_guide.pdfIn PDF document text
    • http://ratazudawi.epizy.com/characteristics_of_life_worksheet_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/kuxifumotutemag.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/mystudentbody_drugs_answer_key.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/wuzaxagoxijelewavalof.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/basic_story_elements_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/xariribunokesu.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/3631682094.pdfIn PDF document text
    • http://kiwozoma.epizy.com/pokemon_emerald_rom_for_gba_emulator.pdfIn PDF document text
    • http://fawipiro.rf.gd/gangster_2006_full_movie_utorrent.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/73471404284.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/52799696695.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/kit_barca_dream_league_soccer_2017.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_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 5608 bytes
SHA-256: 2e317ec3ee3f8de5eb6c4e94f6dea0da7ace11d380b113732e7218b8a7c71a9a
font_01_sfnt_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 10352 bytes
SHA-256: 758c16bace3fc59e590b67dc59f7eaab58363e6c4806dc2006bc3194034499bc
font_02_sfnt_off00010ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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