Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8a1e79018b7e87…

MALICIOUS

PDF

70.1 KB Created: 2021-09-19 05:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5d0ccf7f85e41989de6a96900a629cb SHA-1: 926c086deb983c58dc0379b321946986806c9c4a SHA-256: fb8a1e79018b7e879ab60a47a69a1fea1081e0dfe89f83c756c90069e53b912d
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, exhibiting characteristics of a link farm with numerous external links to other PDF files. The presence of multiple disposable domains and the 'utm_term_redirector' heuristic suggest a phishing or malware distribution scheme. No scripts were extracted, but the structure strongly implies the PDF's purpose is to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://dintainoodle.com/uploads/files/wugemobun.pdf In PDF document text
    • http://booklandbooks.com/userfiles/file/99571525459.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614200135e7b3---jilasipedatufanudapo.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/rolawupixikase.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/wonunubuzaso.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/51826088510.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210913220204.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/sasifiwobubobude.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/40415982984.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/43846684121.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kazuzeka.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/57706772611.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/deselunigev.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/68015415690.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/52875893897.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/vagujuzuwi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/97034036739.pdfIn PDF document text
    • https://edarky.net/data/file/wezavaratakekurejiwovive.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/54035665994.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/wajutekitubuzezezasopo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441f4e335cd---lowajerabaragujemaxajat.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/8337605478.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/22681269578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+obb+file+pubg+mobile+litePDF 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_off0000b39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 10900 bytes
SHA-256: b628a8a2aed85794616595c2a3b46bc51c7d4c15698dde3658eae3925a87004d
font_02_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 15316 bytes
SHA-256: 1c05e1e64e0b22deb68c05589e2faab800eb942f7519d1bbd3b93b789d24a833

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