Malicious PDF — malware analysis report

Static analysis result for SHA-256 acccf41f1d4c2ee6…

MALICIOUS

PDF

87.2 KB Created: 2021-03-22 09:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3e978b2a55678f6cdcc993173ac01881 SHA-1: 90048e54cdc500d860fcc677bfeaed1269e97698 SHA-256: acccf41f1d4c2ee60b1f80bc555091e34a7d14dec6d401b4ad9dcae15944eb64
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a potential malware download. The 'SE_DOWNLOAD_BUTTON' heuristic and the presence of a download-related keyword in a URL suggest a phishing or social engineering attempt to trick the user into downloading a payload. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 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.
  • 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://ponafet.ru/wix?keyword=download+valkyrie+crusade+mod+apk PDF link annotation
    • http://sberin.xyz/irregular_adverbs_list3rmsa.pdfIn PDF document text
    • https://sifixiwip.weebly.com/uploads/1/3/4/5/134596292/bewugekogoras_bodonasi_dedafutu_rozumuxuteluz.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/animal_farm_full_summary.pdfIn PDF document text
    • http://kpovli.ru/simply_keto_nutrition_reviewswktcw.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/jobixuweb.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/basics_of_biblical_greek_grammar_3rd_edition.pdfIn PDF document text
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/nebut.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/4060747.pdfIn PDF document text
    • http://reetodo.online/how_to_remove_agitator_on_kenmore_washerb6su4.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/hermione_granger_deathly_hallowssqji3.pdfIn PDF document text
    • http://winoorama.website/advanced_topics_in_computational_number_theory53ddb.pdfIn PDF document text
    • http://white-x.fun/unix_and_linux_system_administration_handbook_epubhci8c.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/cahier_de_vacancesveisk.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/fakuguvil/nitro_pro_9_full_crack_32_bit.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/usp_purified_water_specifications.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/calculator_binary_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/83106584873.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/49136254986.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/kingdom_hearts_collection_ps4_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/soberafor.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/94391322446.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/managerial_accounting_income_statement_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/jewogudoweworaseviza.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/animal_crossing_per_pc_gratis.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 3032 bytes
SHA-256: 8795105e4bd84445aa3a59d546464243503227bf67a8976c1547373fd856566e
font_01_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 5536 bytes
SHA-256: 5377e60f93226bf864c51457c8f359f896457f461b5c0bc6d978705d1216ce0b
font_02_sfnt_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 11408 bytes
SHA-256: ff931b5b06c69a7eef0418f2af4ea261cdc0d25c3856909a582bc9d28f8d1f22
font_03_sfnt_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 16372 bytes
SHA-256: f7864fa7077ba9643b1a4377f1b952fbb288432cf2c0e81300538c377ed827b1