Malicious PDF — malware analysis report

Static analysis result for SHA-256 a033529bf55c7b3c…

MALICIOUS

PDF

80.3 KB Created: 2021-03-09 02:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ae7b17914fa94d4bc29b6be5f631962b SHA-1: 2ba54f0bc277629efb2d36cbc1cde95dcd5e8340 SHA-256: a033529bf55c7b3cf19f568ec24ac28767416ccf95d6c6144d5794c5ea7a62cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, containing numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, suggests a lure related to 'Faktor hedonisme pdf'. No scripts were extracted, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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://xajibur.ru/award?keyword=faktor+hedonisme+pdf PDF link annotation
    • http://parralax.net/86030113206xpyay.pdfIn PDF document text
    • http://my-favshopc.online/shark_navigator_lift_away_vacuum_replacement_filters5fux2.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/bulghIP/first_electric_coop_outage_map.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/9624114.pdfIn PDF document text
    • https://zotolibufu.weebly.com/uploads/1/3/1/0/131069899/f5a78bc0a.pdfIn PDF document text
    • http://roman-holidays.shop/badri_yeh_chikitha_songv3v41.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/xYRwxih/grand_theft_auto_6_trailer_official.pdfIn PDF document text
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/fomebexe.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/2021_lexus_is_350_f_sport_awd_pricedzzra.pdfIn PDF document text
    • http://atlas-copco.su/563727102887tn1r.pdfIn PDF document text
    • http://ketotreno.buzz/nuzutisagnxaq.pdfIn PDF document text
    • http://opt15.ru/jofuregutorazuraluwigg349k.pdfIn PDF document text
    • http://fortuneo.biz/lasusefananixrg.pdfIn PDF document text
    • http://forecast.bet/equipment_world_spec_guide_2018yt3nl.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/ba5c6979f.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/cjfhfjc/89856253920.pdfIn PDF document text
    • https://cdn.sqhk.co/kevemelis/jiXsy12/chadi_re_chadi_song.pdfIn PDF document text
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/6020232.pdfIn PDF document text
    • http://qrettalq.online/gofujujufidatepasarapuz9tyql.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijizuzinarit.epizy.com/50810800945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4e7607-7868-4176-bc19-cc0952d31c42/brazilian_jiu-jitsu_self-defense_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda019f0-ff69-4112-b640-0950c830f194/menivajopisexujejovomak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3378b686-3e93-4ede-bed3-50290a47c655/the_strongest_navy_one_piece.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed677c5-f0e0-4f67-af44-429ee3482cd2/66895828445.pdfIn PDF document text
    • http://zefinut.rf.gd/12507988909.pdfIn PDF document text
    • http://zunimesigo.rf.gd/90069092253.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_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 5268 bytes
SHA-256: 94b5e3fea5efe05c333470ab09681089522d1abf2bd4753921880acac0cfe93d
font_01_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 10240 bytes
SHA-256: 09c059578acf0c5deae1f6a4039909354a2ef2e67689be62b0ae73a2e801023b