Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8593a29aaeef9c2…

MALICIOUS

PDF

79.8 KB Created: 2021-03-09 20:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 44f1a8aa3fe54cb40d73080da983fdeb SHA-1: 611e6fc7d08cfa580fe897d7a0597980b3036349 SHA-256: a8593a29aaeef9c2fd552f35019713ffc3507e4e76ca1ab85c28ad2cfdb124ba
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a suspicious link lure, directing users to malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the embedded URLs and the nature of the heuristics point towards a phishing attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jottigo.ru/aws?utm_term=yaskawa+error+code+66 PDF link annotation
    • http://dfahsdfgjsfg.online/opensooq_mecca_street_amman_jordandnzm5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483837/normal_5feb5c59070d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_60435e1305127.pdfIn PDF document text
    • http://online-sistem.site/ableton_metronome_soundd8w09.pdfIn PDF document text
    • http://itawegan.fun/grohe_kitchen_faucet_install6aj3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5fdf195433ca7.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/the_ugly_american_full_moviefbbmw.pdfIn PDF document text
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/4839594.pdfIn PDF document text
    • http://kernig.online/graco_lauren_classic_crib_recallky090.pdfIn PDF document text
    • http://itagreen.fun/pufutad64biv.pdfIn PDF document text
    • http://wide-mean.top/points_lines_and_planes_worksheet_answer_key_glencoeeob0q.pdfIn PDF document text
    • http://coloradocustomelectric.com/tp_link_tl-wr841nd_firmware6dedb.pdfIn PDF document text
    • http://ru-order-687646765445.art/sejebojafbh1hn.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/4030b971b028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lekizopiloref/jurnal_alkalosis_metabolik.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/death_certificate_online_free.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_5c444c16fbc4455f847ca060c22f2318.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_f99f8add57a546f196caecbbd61fbf31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/the_other_side_of_heaven_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/2826643000.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/binodini_radha_song.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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 4724 bytes
SHA-256: 98c7384df6c28608421aa24010a85267a0be0d8a04d0929542dc3930c59cda75
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 10240 bytes
SHA-256: e5f71e72df9fced8f531e6c73fa345473762ef1bf40ad199f4300dd0538d8fb2
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3