Malicious PDF — malware analysis report

Static analysis result for SHA-256 7905aa14e91b514d…

MALICIOUS

PDF

63.5 KB Created: 2021-03-14 00:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ec4fb62df6812824f7d798d1711494d9 SHA-1: 588d034ba873e4152a636e24f08f817ad1a12f95 SHA-256: 7905aa14e91b514d784b5daadce2e7940c265a8348f7a71753f060bc6e59d199
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://golowaki.ru/wix?keyword=gd%2526t+application+and+interpretation+6th+edition+answers+pdf', is presented as a search result for a specific book, indicating a lure to a potentially malicious site. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://golowaki.ru/wix?keyword=gd%2526t+application+and+interpretation+6th+edition+answers+pdf PDF link annotation
    • http://fufetaka.iblogger.org/subaxirejuxeburax.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/7806450.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/6108309.pdfIn PDF document text
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/tepijaz.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/dibedamoka/catalina_10._15_gm.pdfIn PDF document text
    • http://jafutalamisa.rf.gd/roadside_picnic_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/weather_report_decorah_iowa.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/vafugubedumek.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/pdf_apply_watermark.pdfIn PDF document text
    • http://bubevitivapel.rf.gd/android_emulator_for_iphone.pdfIn PDF document text
    • http://latujetob.epizy.com/call_aundi_video_song_1080p.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/calculation_of_equivalent_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/85588948965.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/kotasut.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/future_perfect_tense_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/54054740947.pdfIn PDF document text
    • http://delenujafoxa.rf.gd/antutu_benchmark_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/falik.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/the_easy_way_to_stop_smoking_permanently_audiobook.pdfIn PDF document text
    • http://gofozumi.epizy.com/pink_glitter_in_the_air_sheet_music.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_off0000c232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC232 4328 bytes
SHA-256: 4998a3b79f38682715cf2b6c0818cead8bcb0eb05e73c0570aa646acb1f52449
font_01_sfnt_off0000d0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 9416 bytes
SHA-256: 1a5a25bdceebbbb9dc15732d5c646ff64e420b13a8c6d75659c4629872a55435

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