Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fda09f6d14c206…

MALICIOUS

PDF

86.0 KB Created: 2021-03-03 21:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 274ef5e7c9cca3227a267925aeb731a2 SHA-1: 98b5b7cd62d49c00f02ab52959793a87eb599d09 SHA-256: f2fda09f6d14c2063fe151870aa0f3b0b3ba8506f0dec6206ed0a2e8a39eee35
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' and a search query suggesting a lure for calculator game enthusiasts. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with 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 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://baarspo.ru/award?keyword=ti+82+calculator+games PDF link annotation
    • http://ziwigosopijulal.mygamesonline.org/71959721734.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/how_do_i_charge_my_zagg_rugged_messenger_keyboard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_602eff76af5f2.pdfIn PDF document text
    • https://cdn.sqhk.co/kosaboze/hheghij/bouncy_castle_fips_java_api.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/fLhhEEu/alarm_clock_sound_download_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_5fea32b4baa2d.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/rjjhggN/calculate_percentage_between_2_numbers_in_excel.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/vebakedipan.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/jcihkib/steam_gift_card_amazon_5.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/panuwalafiderevudutodum.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/how_much_is_hp_pavilion_15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_603a9baa1ea51.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/fexuror/guzevaduxasunipinofegasuj.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/goxerosenufemepita.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/ranesepazadilupiwuwuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/gigobawixijawisonek.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_off00011584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 5392 bytes
SHA-256: 190c342c71bda2776ed659b0e11935ac501f9d601dc0c128222a9186b5535e48
font_01_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 10364 bytes
SHA-256: 28025ddcc83cdabcd5e114068c140707f349920676704102f22f02b39ec9da6e

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