Malicious PDF — malware analysis report

Static analysis result for SHA-256 4817e91a9f5f42ad…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 06:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b04a59d185cd09dc6c097345437d6d0 SHA-1: d099c6381925c6a2631509d9d14f0624e371b618 SHA-256: 4817e91a9f5f42adb01cc0234c806116f9bc7b4e25fe752117f302a34570fe11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior, suggesting a phishing or malware distribution attempt.

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 https://inwebjor.ru/uplcv?utm_term=how+to+update+all+apps+in+android+phone PDF link annotation
    • http://abwva.com/uploads/files/sajotiwojerasawim.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210903132203.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/zufevaponurunix.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/wonusaziwil.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/36231122935.pdfIn PDF document text
    • http://emaaravm.net/upload/files/17961190081.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/bizibexagizunu.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/22962238149.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/41227382496.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/soxopupisuzak.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/tasazexamivofode.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/57418458505.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/88976131271.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/4102597963.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210904150337_lv4aji.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/54052693312.pdfIn PDF document text
    • http://sentai.cc/data/file/20210912_070425_344.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/torufuzojenirobes.pdfIn PDF document text
    • https://protrialse.eu/files/files/rapuwevelefobanepifug.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/juzalemisexale.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/66149923931.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/weferevokafodafisudimoso.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc5ff94259---60079680065.pdfIn PDF document text
    • 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_off0000c2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CC 17568 bytes
SHA-256: 16cf670907dd620175c94a722945ae96b23dabda09568caa85fb85818c7aa9a2
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 10664 bytes
SHA-256: ed84289c1e6a6d2b52f273f2c4fe650e5d63f0df5bf951b31a95c1ad502c148c

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