Malicious PDF — malware analysis report

Static analysis result for SHA-256 182c1bc911e7c811…

MALICIOUS

PDF

78.9 KB Created: 2021-10-07 02:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5ce848b800857fe1f27d8f54012d4d81 SHA-1: 2bdc7d337d78bacac97125659373e8c9ac0dec95 SHA-256: 182c1bc911e7c81130f6a56d7511e5efbba491c455a11391cba4b8aa8a9a075f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing infrastructure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. The primary attack pattern involves redirecting users to external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=ffxiv+retainer+guide PDF link annotation
    • http://cieplej.pl/imgturysta/file/tipimikifasesudagoseviw.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/wevibugewub.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/tisuxabexubakudodoko.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/91082175407.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/wuvesosutorizuboli.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/4208031440.pdfIn PDF document text
    • http://m2m2design.com/userfiles/jamizetibovunimegelij.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/71066597180.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/rukilejoji.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/52254100708.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/xurowovazekugasuf.pdfIn PDF document text
    • http://livestocktool.com/d/files/73065595388.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/mokekosuxosofiwa.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/27983304910.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/92222168920.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/42953189795.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/fevoxelugos.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/wibafilugilafazukejix.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/79899520233.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210905123614.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210907042728.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0e55a4365---18663786192.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_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 10440 bytes
SHA-256: 664167b989b7aa0e9c92ee401e662697227db19d0ff5ef572535e7cc8f3c920e
font_01_sfnt_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 17624 bytes
SHA-256: 7298d55927e62fc4c01b7f51c3883b463bdc15b1a41e309bbd2653a93f5cee8c

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