Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b7ce82ba1d0bde…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 10:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0f8fbabb4e82954e9b221bfcdbb9c2fe SHA-1: 276fffa6482e7a2cf98f192c4bf78aeb7f8f1918 SHA-256: f3b7ce82ba1d0bde1ee38cd76ad6847a043b70dabe1be32784a50fac070b2b42
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, many of which are unknown or suspicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://elmbbq.com/uploads/files/72574763732.pdf In PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/48675659180.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/78539454143.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/patukoborukegakekevev.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/76549084180.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/wenibewibotog.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/09a80613934158782a1f062645bb1e39/93838597603.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/kumovuwujatagetavid.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/80856682261.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/mimol.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/94739628875.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/sibep.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4d28c75bcc766715b995bac2603fcdbe/81642899551.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/rovakomuwaf.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/sesokalavenagikosixuj.pdfIn PDF document text
    • https://ptogel2.com/contents/files/rovelomaxonafagenezajidux.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/korovotexigupe.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/88018167217.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/fepuvagogaj.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/28158161418.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210913/file/gotixenov.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/56568007030.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/74653233655.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/fitixejoxafirusorupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dns+settings+in+mobilePDF 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_off0000c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10328 bytes
SHA-256: e33abba3cae8b92a4102ad3c98dfe396e88ba5ba03094a210335626a2f84fc58
font_02_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 17096 bytes
SHA-256: d3fc7e7831f3fe6527a873a1e533f2bd69bc02f15f7078abce129d10d694612c