Malicious PDF — malware analysis report

Static analysis result for SHA-256 671155789b8df66f…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 13:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02e101c1ef0a8bc5a33896d4a70dbccf SHA-1: 316874f109a8e2ba2c39f1b4ea06e4b2e1ef2bca SHA-256: 671155789b8df66fc78a1c3740a71c1f64901d372ca1090f5032fcfcaa142900
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, likely leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=voyager+of+the+seas+rooms PDF link annotation
    • https://nepalmicrofinancesummit.org/userfiles/files/lirulozulatewamagovo.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210906195349_p9gyp0.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/botewuzelabale.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/dixovo.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/ginuzuwajinomizedusuzod.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/60004127708.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d663dcb8fab741bc10d7332e298da196/desawomadidifanitubipi.pdfIn PDF document text
    • https://kawanmto.net/contents/files/xurazozifujuzarefuz.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/wuwararu.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/51384959887.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/sevik.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/87676992322.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133462f603c5---towamojazasewuvufefo.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/veburoxefiboki.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210924_46BF9A22ECFD16EB.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/rakinotelapesawawiloxafi.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/20274628465.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/fubepapof.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/fituveratozadulamibikakus.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/fakuwulabu.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/xenumomix.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/sosowigodatade.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_off0000af40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC757 10504 bytes
SHA-256: c5846ff48d11f7d5ba3ba6c1c414e54cb10fec3df214d61693ca627ac958d5f4
font_02_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 17476 bytes
SHA-256: 784a4a23a1dc5263552a4aa6ca2abe3e657a1731b3e13a2f879246d635bdb6af

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