Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b7a66405cf716c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 10:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fedc5669f6beffa78d360de6ce95c26c SHA-1: 3879c7a5b8ef93811f6c97f17cf5900589fbb137 SHA-256: 11b7a66405cf716c9b10bf21ebf7e37ddab7c7c87f9aec0b80857bfa7cb16259
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external PDFs hosted on what appears to be a link farm, a common tactic for phishing or distributing further malware. The presence of a disposable link farm suggests an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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://icnj.net/ckeditor/ckfinder/userfiles/files/75612503958.pdf In PDF document text
    • https://eltechma.com/zdjecia/fck/file/wovaxulijekegiwuveg.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/9032705973.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431b0b6e985---kabuxipopisoledikivorixok.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/didibepir.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/49589254333.pdfIn PDF document text
    • https://begili.com/uploads/image/files/womamenewefamukukini.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///55397046378.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/lafajidixafasunebi.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/kabegozurikuxixilonifewo.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/86076187170.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/10716142546.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/kufos.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/jekuwepujufi.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/kalizuzivupevoxo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/pofak.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/gasinugiwiluluxesozawotog.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210914114840_480882229.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/73702910758.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1263cd0b---12290137387.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/xivinunefemoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gcam+7.5+for+redmi+note+7PDF 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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 10712 bytes
SHA-256: 89c134f606044013a99d215637f2581f20abed2fbab8b006a419e40e7c68de71
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 17648 bytes
SHA-256: e61a0b701bdcd8f64b5ae9b812f2800a440eec6de7638cb7dae5d950efbc38e8
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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