Malicious PDF — malware analysis report

Static analysis result for SHA-256 172d718368db9da1…

MALICIOUS

PDF

91.6 KB Created: 2021-10-06 13:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 083207337ddb382e5ebbea772b884e7c SHA-1: 4c67589c15ffdaf83a18b03fcc5ea3e95ebdfefa SHA-256: 172d718368db9da1c17f86e0816919ee45577d6f46855b1fab0ccd310ba8a38e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of many unknown URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://cameragiaminh.com/upload/files/nifajitajezudu.pdf In PDF document text
    • http://greenvisioninternational.gm/userfiles/file/sazazaxavutejewovu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f18badc5d0364096009ef047db8f6a9a/tadibakiwope.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/boteseri.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/76820607715.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/27453117801.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///84059360577.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/digebul.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/55997019099.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/72250810821.pdfIn PDF document text
    • http://bastola.org/userfiles/file/pizifunizalir.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/bixaxilidufutoru.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/52313839112.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/jelolonugoxiberigudop.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/sisisite.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/doxubukalujusojakasa.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/58333604299.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/10321496704.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/5605579869.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/kokedalirabimekerude.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/51351850376.pdfIn PDF document text
    • http://maintenancebazaar.com/userfiles/file/62086161310.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/84631074743.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109021004169894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=just+sing+along+to+my+stereoPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 21884 bytes
SHA-256: 24d5a47037c80f9b23faf595afa94326d5f0f611183908f791c4e5db5933f3f7
font_01_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_02_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14634 10656 bytes
SHA-256: 0b404adddfc41df9b02e13710f7608a94f8c0c5e80b49efb2ee376a17ec01a7c

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