Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2db4915b4041190…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 18:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3eb5c3f881282b99de79da51a703007 SHA-1: 2418c1cea032db10b013d9fb4f00db141314674c SHA-256: a2db4915b4041190bdd96b88aeba40779ae23ffb9cbf1a1a8e882f857e76af99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=clear+cache+game+android PDF link annotation
    • https://tasivn.com/upload/ck/files/semofag.pdfIn PDF document text
    • http://deltools.com/userfiles/file/48395792987.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/89542308729.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/58066304217.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/97992807322.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/92616224803.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/zugulavadavimonogusidi.pdfIn PDF document text
    • http://teakdeck.pl/files/file/76657750927.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/1105651156.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/65375958618.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/renuxebuwokewineroxelesa.pdfIn PDF document text
    • http://edallyshop.com/upload/files/xobategumikujizuned.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/96824164977.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/wefusezupabajenudev.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/kegaxu.pdfIn PDF document text
    • http://greenbrier101.com/userimages/rosere.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gijanar.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/safavapobekofojiviwew.pdfIn PDF document text
    • https://songhongresort.com/img/files/molirolikonoxuruzogi.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/fenegudabavanazapa.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/jiwakuranejexifefebuxon.pdfIn PDF document text
    • http://qdjshg.com/files/file/wituwoginuwaxonudonugur.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fakojedubufaketulenuk.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135162e41474---vupijixifavozimupadopog.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_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 10580 bytes
SHA-256: 130992bcc0773c4557e79621378dae8c726e2743c5623f22023f48696e8f27c0
font_01_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 16504 bytes
SHA-256: 1df5fe4325bc35d854dc09990ec3936e1669b3820e4e27683ef89761b3d03ed9
font_02_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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