Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ffec014eb13a1c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 20:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb1713bac62f4462f04d76b7c79e8b9e SHA-1: 7bde669959783f71ee7589240a3acf43bfe3047f SHA-256: 43ffec014eb13a1c2301a59fd898529a38fdc3baf7eec06717cf1957b4e616e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=samsung+galaxy+y+mobile+games+download PDF link annotation
    • http://ghalemdi.com/userfiles/file/kenob.pdfIn PDF document text
    • http://scarpatti.com/files/43097876187.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/zujakexef.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/72862115503.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/61580011615.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/renirebaluw.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/15528697717.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/57890509939.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/92719883687.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vabejexonivuzivaje.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/zozolivajetizalur.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/xusuvodewilawumatipimasa.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/gexoxizana.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/17355481714.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210913205042.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/barugiwewobateju.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/38523731206.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/14071145640.pdfIn PDF document text
    • https://kopari.hu/files/file/63149057024.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/16190526057.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hfct71cjlr0lag8ea4rjhkca10/12018125450.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/46486680366.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210913115047.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_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 18240 bytes
SHA-256: ca3d2f05b87ff0d9173829c9f07081f0bc86430bf9f0ec0109c228fc89fc94e0
font_01_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D0 11012 bytes
SHA-256: dba6b980d199bca40dc767739d066906d353a38b5341e82c6ec68a8bd2b296da

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