Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f154be054e599e5…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 03:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6241870ea9d8843f74ec25203cf5018 SHA-1: 8ffcefbd07e2663f1d7afdff6fd9200f5f2c3849 SHA-256: 5f154be054e599e5bb806ccf1603cb5e1dc078d54b92e0fe3c420e2c307025fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point to a pattern of redirecting users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings suggest an attempt to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://jandebruijn.com/uploadimages/files/fudatefogabijimulugepil.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133462f603c5---towamojazasewuvufefo.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/46704871026.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/36029396765.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/55622613125.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/pugodawapefusol.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/10082291570.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/23213716530.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/55569860950.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nerasakolidetu.pdfIn PDF document text
    • http://irollee.com/userfiles/file/92264371743.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/26842749463.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/39344258983.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/75551637518.pdfIn PDF document text
    • http://airfa.it/userfiles/file/lulilezekurumozazama.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/gelopijafozejupipolir.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/88212927675.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bojot.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912081750.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/zijubavawuzekaxasaguvazes.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/jumonelenutezoxonife.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/94075935050.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/57368911488.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/70817269442.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/14913664215.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/xazebadotajo.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/rowiwodedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+sign+out+of+hotmail+on+ipadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 10892 bytes
SHA-256: 431594c66bc671eadbba67dfa132954814c2be5a5690b416056f9df9302edb90
font_01_sfnt_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 15016 bytes
SHA-256: fccd54006305e2b9a524158dc3d23789ac1bcd6a1f1c2a2a45e30c89afeda9dc
font_02_sfnt_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1