Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7afc742f19a910a…

MALICIOUS

PDF

76.2 KB Created: 2021-02-07 22:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5fc8a223e2f9a570d8b287bbac3eb0c8 SHA-1: 8f6a78dac8d333be827c576542389ff96ff8d56d SHA-256: f7afc742f19a910ac5b1e010f78511e20bfb6a4947abf84d0100875b26bc5f83
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/123?utm_term=divided+by+13+amps+australia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371787/normal_5ff27748b5a62.pdfIn PDF document text
    • http://digerutejonoju.22web.org/67447525472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5fc6cdc995552.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404308/normal_5ffe199aa02a4.pdfIn PDF document text
    • http://bandalet.club/acrostic_poem_template_free_printablezckzi.pdfIn PDF document text
    • http://topstudy.fun/8059772106286jam.pdfIn PDF document text
    • http://falopeliti.22web.org/94593221267.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/fubufusigimumudafomikogodnreb.pdfIn PDF document text
    • http://espacecmb.xyz/42439760955xr5pq.pdfIn PDF document text
    • http://world-wildshop.com/libro_amar_o_depender9d63r.pdfIn PDF document text
    • http://olymp-trade.top/serukomums30r9.pdfIn PDF document text
    • http://azorocheat6.xyz/38107038789xyiww.pdfIn PDF document text
    • http://im-marceting.site/xexepodejiz0hqei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_60161b6e1798d.pdfIn PDF document text
    • http://helpcopyright-service.com/21418744754qts1z.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/wovitiku/japasusufibaru.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/dialogue_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/kitabejofitasefupir.pdfIn PDF document text
    • http://gawasaxe.epizy.com/72373717125.pdfIn PDF document text
    • http://godidab.epizy.com/till_there_was_you_lead_sheet.pdfIn PDF document text
    • http://xubulaxojetuka.rf.gd/dutobasutijomawujex.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 5288 bytes
SHA-256: aba64dcc38da7fe6121b8fbed8c86f8549646554836e65d22247f2384a615b5e
font_01_sfnt_off0000d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 2052 bytes
SHA-256: 1ee6b1f26b48ba765824897ade8e5054afbdad5a0a39cef4d789526903ed532d
font_02_sfnt_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 10588 bytes
SHA-256: 869cd71bd3ac27db8d8316c6a05fdc3e116192bf1f4f9084500b00e1bd3b470c
font_03_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16228 bytes
SHA-256: 1d5db48327d30ec541c8869952c86ae85e5b0da586525807a98126af7a5ffd79
font_04_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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