Malicious PDF — malware analysis report

Static analysis result for SHA-256 5874811b9fea4edc…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 12:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b9d1f0e862da813139bb31625b8328b7 SHA-1: faea5a54bbf82f0ad8e33b8429170ee72842f6ab SHA-256: 5874811b9fea4edc03a02b28533d6678cc073b2924870ebd1d995765e0c44ab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to PDFs hosted on S3 buckets and other domains, suggesting a link farm or SEO spamming operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://zajinet.ru/wix?keyword=manual+pierogi+machine PDF link annotation
    • https://cdn.sqhk.co/kazamepa/ijGgehb/vezamuxadolirubutigeba.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/k3wDVhh/maze_procedure_medical_term.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/rgctbjd/free_litecoin_wallet_online.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/jajajix/ww2_polygon_download.pdfIn PDF document text
    • https://cdn.sqhk.co/juvosuneni/eMXbiiS/palo_alto_pa_2020_datasheet.pdfIn PDF document text
    • http://gemajelibetojup.scienceontheweb.net/96202399478.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/9485838.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/sufususiwuludotoxogoxab.pdfIn PDF document text
    • https://cdn.sqhk.co/zeburozupax/b4gdvha/holy_city_brewing_new_location.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/eOhaifo/xosuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/Biaigid/pifokemolirirekudoweka.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/ggjPUa3/basketball_stars_perfect_shot_hack_ios.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/c54f5d888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bofake/98450284429.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/karugupas.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/50_shades_of_gray_3_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/94357732430.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/wastewater_treatment_process_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/arreglos_multidimensionales_en_java_ejemplos_resueltos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 4404 bytes
SHA-256: 761589c06452294541202be112bb50251115953350b8615b3f438a9b2d9d2a23
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 5176 bytes
SHA-256: 68c97c838ed9d0b14c117826bf50b84fc65841bd11703b62f2650797eac7595b
font_02_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 10704 bytes
SHA-256: 51d51c76be52e9d64e318878f5439530cfbb504db019c0e798424804106ef1eb

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