Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab317ac33f50c6dd…

MALICIOUS

PDF

72.6 KB Created: 2021-03-13 13:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db95227da2fc3752025b6edcf053b0b1 SHA-1: 5ef9c268fc9fab85c5198f0eb4dc107e53a1b34d SHA-256: ab317ac33f50c6ddda981e1ade01f05fa064944a62caa500da472c86761475ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=sandvik+catalog+pdf
    • http://tijudiwulewanuw.getenjoyment.net/muxamawosikimexolaj.pdf
    • http://vazewuxu.mywebcommunity.org/5558546149.pdf
    • http://foxiduwanati.mygamesonline.org/89255718879.pdf
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/firisa.pdf
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/1271342.pdf
    • http://jalazekesofijot.medianewsonline.com/tracfone_moto_e5_unlock.pdf
    • http://famozosivupiwij.sportsontheweb.net/how_to_get_share_the_wealth_cards_in_life.pdf
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/nuwugeniruwesu-xiwefodov-fofibuwodipi.pdf
    • https://fomimixa.weebly.com/uploads/1/3/4/7/134775862/juzijigotolib-wutitagam-wewogijisodafa.pdf
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/6211965.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vejegaba.atwebpages.com/latest_society_bye_laws.pdf
    • https://s3.amazonaws.com/wutogugej/zoviwuzozututesobex.pdf
    • https://s3.amazonaws.com/mubemutolewe/pusomedevejozisoxijazad.pdf
    • https://s3.amazonaws.com/fofeguj/c60n_circuit_breaker_datasheet.pdf
    • https://s3.amazonaws.com/kitakilesa/27875002944.pdf
    • https://s3.amazonaws.com/ditiruz/binomial_distribution_problems_worksheet.pdf
    • https://s3.amazonaws.com/dojivewobasuval/78731874536.pdf
    • http://nidikofuwovi.rf.gd/abp_ananda_bengali_news_live_app.pdf
    • https://s3.amazonaws.com/viromibukoleliw/88158852479.pdf
    • http://naditoliwinudev.epizy.com/45188093203.pdf
    • https://s3.amazonaws.com/zidosozawok/manualidades_hechas_con_material_reciclado_para_nios.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d021.bin
8573c9ee610aae54284b316c9395c9aaaf57e9d9781aea4f63f212b992cbaf66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 4948 bytes
font_01_sfnt_off0000e104.bin
db28f5321d77fa5c945176c29378c57edfca74488cf67dcd794deb3476263b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 10792 bytes
font_02_sfnt_off000105d8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 4324 bytes

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