Malicious PDF — malware analysis report

Static analysis result for SHA-256 70535fc01d8cd7ff…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 11:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8baa176f01575c3097167db1a0f8295 SHA-1: b008b282af93ef848eaf732a9d05437890e13619 SHA-256: 70535fc01d8cd7ff0adf1e999ea0cc83578ce50e32dc7775754b0deabea9b5cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. The document's structure and heuristics indicate it is designed to trick users into believing they are owed a prize or funds, which requires them to pay a fee for parcel delivery. Numerous URLs were extracted, many pointing to potentially compromised or disposable hosting, suggesting a distribution network for such scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://learningsolution.ca/userfiles/files/51137219027.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/jeliso.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/95353998550.pdf
    • https://iphone-odklep.si/vsebina/kubawumo.pdf
    • https://sherwoodchamber.org/ckfinder/userfiles/files/21834055699.pdf
    • http://jtylek.pl/Upload/file/62734352421.pdf
    • http://l-max.ru/userfiles/file/kudimum.pdf
    • http://timnhanhonline.com/upload/files/61746817036.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/45735243381.pdf
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/97436734587.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/39532834831.pdf
    • http://epoxidice.ro/mm/file/fewulitowelexolinuxulibi.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382207260b9---jajolekadakukugugiga.pdf
    • https://zlatartopalovic.rs/files/mizuloxonojewo.pdf
    • https://labelmarket.eu/data/file/83489467201.pdf
    • http://vkp.ru/upload/global/file/43537432329.pdf
    • http://urs-certification.com/gais/image/file/87352869253.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/77651731073.pdf
    • http://metall-press.ru/files/pibomavelilon.pdf
    • http://nceed.kr/pds/userfiles/files/lazixusuri.pdf
    • http://bradzo-ep.com/uploads/files/fobezokedobo.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c0b7c0e2330c663b79df00904b529fe7/71179935956.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c6e9549ec75070129c2aff6c77fdbeb0/tenorel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+year+did+android+phones+come+out
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin
1d9692cd708965d96aa88748742db4fdeddc58a8cb87368298d481249cc50ab3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10940 bytes
font_01_sfnt_off000101ac.bin
fcce515d07d1ad6390364f6b260374edc59f8c2e88f50233d7fdcaa326cea9e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 18180 bytes
font_02_sfnt_off000130cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130CF 16792 bytes