Malicious PDF — malware analysis report

Static analysis result for SHA-256 d160688b766221f7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 00:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 101b43d5346daca044cbaa06c82e7a31 SHA-1: 513fe0fc345d6a5ad276610dfe8901ac0a129f42 SHA-256: d160688b766221f78729f9c58f31813df0edf645bce6bd24edb9dab2720bf5fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sanzmendia.com/userfiles/files/norez.pdf In PDF document text
    • https://silverbirdmarketing.com/pages/images/file/mutonele.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/gejovoxibes.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/57769022439.pdfIn PDF document text
    • http://otczenacts.com/media/files/72820678825.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/56332915074.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/fivotofiwulesowadibomu.pdfIn PDF document text
    • https://afayl.com/userfiles/file/gexuvoraruk.pdfIn PDF document text
    • https://dafelia.com/files/xunapisivejute.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-7/20210907231754239308.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a431d87fbb5d42eb5028ed62b5c3d774/66462912538.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/jisokisovamuvokoburasi.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kodurivogetibarusonivako.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/lezolewademopejebawutazo.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/67441599172.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xanobimotilupovebukos.pdfIn PDF document text
    • https://mmtours.si/uploads/75188180072.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/nimotitebamijunosalu.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/49343718067.pdfIn PDF document text
    • http://artediapharma.com/upload/files/gikosimixeli.pdfIn PDF document text
    • https://thehouseproduction.net/file/lukokadefonerubisipul.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/pazirefuronotomaj.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/31211826526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=this+is+no+way+to+say+goodbyePDF 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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 20364 bytes
SHA-256: 761252226a08b2767789ded48e12ee0337e75c750a27f669227c03adaa07a699
font_02_sfnt_off00013444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 10684 bytes
SHA-256: b259c5218bb70e42e4add9c425aba60eccaa59bca425f34b5cbe394f3b6faf9c

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