Malicious PDF — malware analysis report

Static analysis result for SHA-256 9477fd392f440683…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 17:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b09cd52f6e3f45b9cf8e69dbb127329f SHA-1: 7efcab3ec5ce686f0d0ccefd68320a1810abeba3 SHA-256: 9477fd392f4406834b4164f877647e0d70e3c7458858dfa71b81e9807a7e80b6
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a likely attempt to use the document for SEO poisoning or to redirect users to malicious sites. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://midufefew.ru/wix?keyword=the+world+on+the+turtle%2527s+back+chart+answers PDF link annotation
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/gagamavufot_furakubepa_lejaxuvijose_sugorufaru.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/books_on_body_language_and_facial_expressions.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/authors_purpose_video_4th_grade.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/wedejorowori.pdfIn PDF document text
    • http://pusikoxelumide.iblogger.org/google_docs_agenda_template.pdfIn PDF document text
    • http://waresumozaxaxew.iblogger.org/the_odyssey_download.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/sasizuxotatewolu.pdfIn PDF document text
    • http://pubofumoxo.scienceontheweb.net/birkat_hamazon_reform.pdfIn PDF document text
    • https://purubagenipobeb.weebly.com/uploads/1/3/1/3/131398544/xibakubanikurumovu.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/problemas_de_porcentajes_para_primaria.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/b48243e45fb.pdfIn PDF document text
    • http://sewukagazub.mypressonline.com/90878963218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fipivolakiwupod.rf.gd/bitter_leaf.pdfIn PDF document text
    • http://tiliken.rf.gd/cpc_certification_study_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574eac92-36b1-4f71-ac22-fc7ee4bf6472/rejikoseruloveberas.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/informant_synonym_norsk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b8790b-0037-491f-8aeb-ea218369f19b/singer_sewing_machine_237_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728f2513-c2b9-4bae-8100-2279a15cfbe4/33003135550.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/79202655981.pdfIn PDF document text
    • http://raxatimax.rf.gd/flagstaff_snow_report_weather.pdfIn PDF document text
    • http://fokuxukidedir.rf.gd/kitasat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2463ef-aedd-4e0d-9a04-14b4cc91d731/ap_human_geography_chapter_7_ethnicity_vocabulary.pdfIn PDF document text
    • http://zikapoxev.epizy.com/vofipuvimafad.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
    • 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_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 5304 bytes
SHA-256: f67b074fdec36bdf24d7ad3da44bf3c3be106a5986ad871df35bcfada8376acf
font_01_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 10232 bytes
SHA-256: 86e02bf7ea2f5cf02011dd5c370621c9d56013835aea1ad88542f5156a5f825e
font_02_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073