Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bfa5083dd5d56b…

MALICIOUS

PDF

70.3 KB Created: 2021-03-23 07:38:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a8e3364e849218a2e933e917b367be3a SHA-1: 5b55b0d7ca92dc233e5eae82bb16626fbe047238 SHA-256: f5bfa5083dd5d56bcae9096e3310af4c2e5537f6f4158b62792c0a448754de5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=jim+hill+high+school+jackson+ms+football PDF link annotation
    • http://jovepodixowofow.mygamesonline.org/60619581228.pdfIn PDF document text
    • https://donimafu.weebly.com/uploads/1/3/5/3/135395233/nubir-tujajilow.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/84804137762.pdfIn PDF document text
    • http://nuverlites.online/xowopebztsz.pdfIn PDF document text
    • https://lazarenebuf.weebly.com/uploads/1/3/4/8/134885148/1949730.pdfIn PDF document text
    • http://bepegut.iblogger.org/giwajo.pdfIn PDF document text
    • https://zerasogamonan.weebly.com/uploads/1/3/0/7/130775055/8090947.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/past_perfect_past_simple_exercises_3_eso.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/nenabanewob.pdfIn PDF document text
    • http://vinorama.fun/zoburedafesomijimodibgx2rh.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/78388460303.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/89431939227.pdfIn PDF document text
    • http://emmetrix.net/vert_shock_exercisesjyusu.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/wesopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_e2e3b93180794d28b9584c87d0134914.pdf?index=trueIn PDF document text
    • http://fegarezitima.rf.gd/city_of_ottawa_recreation_guide_fall_2017.pdfIn PDF document text
    • http://zutibebasonuf.epizy.com/faxibidopokitike.pdfIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_5678b6ebb1ab4a8cb10e40e2b1e281a9.pdf?index=trueIn PDF document text
    • http://bopexetosezulav.rf.gd/reponix.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/87487619664.pdfIn PDF document text
    • http://gufobipadu.epizy.com/candy_crush_soda_saga_apk_unlimited_gold.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD330 5468 bytes
SHA-256: 446580657abf72b6c81c7a7be5beeccb13411cc22228af9f220826e3a3666f49
font_01_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 10644 bytes
SHA-256: be2446bb4ba285323b54bbc816083953a56455a0b8e35e28a017c0797101933e

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