Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e941c1c621e3b22…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 11:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f743e2ed8c1635a91750eee96a83f288 SHA-1: 899d40f64a4f83497388b1da0d7844fab0a7e0dd SHA-256: 8e941c1c621e3b22a343e83f2817eb23e7517f763e91f0f211952417a4d7ade7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to potentially malicious domains, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate attempt to create a link farm. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maffart-guy.com/userfiles/file/85673177224.pdf In PDF document text
    • http://j1ent.com/userfiles/file/20210912081527.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/jazavenakiruzo.pdfIn PDF document text
    • http://rapet.hu/files/kowivapogu.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/gemikalivabuwafaxalus.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/dosorufu.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210907194709922.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/kijilasilizagurovuzepa.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/dazeg.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/davuboxapopowajumumonid.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/87310322545.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/nitoxolofuvibisafoposo.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/73431953391.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/xukek.pdfIn PDF document text
    • http://exima.kr/userData/board/file/limevonosibaxor.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/falexikalotiwekeku.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/tifikiwen.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/pizuzegekabasinemekiv.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/vivomuwudabadasitazanoj.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/likuwinepejunulidise.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/buwomis.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/jevadusisawusuv.pdfIn PDF document text
    • http://sb-78.ru/files/file/17772115907.pdfIn PDF document text
    • https://umartravel.com/files/23678226733.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021951050345877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=appium+eclipse+android+tutorialPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 10756 bytes
SHA-256: 58f97f6dc25802be29e9e2b40ce27f2576b390ffc79c63ac21230d57696a24ff
font_02_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 17668 bytes
SHA-256: 3d170cf0382f414c6a376e113217af088b4d130a82689ac2b0c66a186940fbdf