Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f2c70de6eb0a7f…

MALICIOUS

PDF

73.5 KB Created: 2021-10-03 13:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e604af5f9badce2de71b120fff11ba8 SHA-1: ed42257372440258c276d2b60fb0ee6b59496f2a SHA-256: a6f2c70de6eb0a7fbf4e34544fe9f84b2dacf66c9a18481a44be9a05fb3335cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://boldogelet.hu/media/31252612549.pdf In PDF document text
    • https://susta.vn/userfiles/file/96003714087.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/gozomiviroxikujuvime.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/64609692540.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/depexelixiv.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/38602469543.pdfIn PDF document text
    • https://combrooncom.com/contents/files/63531185344.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/sedinupadetutod.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/34451450705.pdfIn PDF document text
    • https://tuinvandecruys.be/file/99949103892.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/8908702403.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/45330732165.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/pobiparugadogabamovog.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158e2916beb0---vidizazulizabowo.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/13400927217.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/29268224590.pdfIn PDF document text
    • https://stormester.no/files/file/bajadakikezewizesowenaloj.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/xazusukamubonakirewi.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/12521142350.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/telipu.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/63582067880.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/34475637125.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/30193510433.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/sabeferuwezok.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/tilufike.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210929_8CBDCD30978BE1D3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=african+tulip+tree+in+tamilPDF 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_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 19548 bytes
SHA-256: 8916ace456175edae13b61cfbf8a36e1c66aa60a1923b0d95f245d4bb1908072
font_01_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 10432 bytes
SHA-256: ad4fbec88bbfc5a8e5c243cc64b01bdd583d40bf7928fcff8d8b36aa8322a11f

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