Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6c9e9a0f6b8cc2…

MALICIOUS

PDF

102.9 KB Created: 2021-03-28 04:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aba05bf35cdb55af1c7ae3fa85f2c63e SHA-1: 51b292854e2e8bde5ad7db6edef371f1a259dfe9 SHA-256: 3d6c9e9a0f6b8cc235a87ef8a188c2711a2a5a08c0a68e937fc6a1f705e0ca29
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of techniques used to deliver second-stage payloads.

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
  • 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.
  • 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://midufefew.ru/award?keyword=bienestar+social+psicologia+pdf PDF link annotation
    • https://mukozuzaze.weebly.com/uploads/1/3/4/2/134265885/korule_gujuzugigenak_paboravadid_povitizugikogon.pdfIn PDF document text
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/xufipiruwuvilejos.pdfIn PDF document text
    • https://wutaleba.weebly.com/uploads/1/3/5/3/135390467/wigegebixikexuf.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/jejiijW/xukawuni.pdfIn PDF document text
    • http://groby-ritual.online/where_to_buy_yellow_rose_bush_near_me3wi9d.pdfIn PDF document text
    • http://stat-index-co.com/hp_probook_6550b7zblq.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/NjfHgga/16600361862.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/eogyijP/48877670396.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/be8XgjS/1559072901.pdfIn PDF document text
    • http://mnclassis.org/how_to_get_lots_of_money_in_sims_4_without_cheats3eqlc.pdfIn PDF document text
    • http://vsspb.ru/kizebirug6kkui.pdfIn PDF document text
    • http://8bitbeardsco.com/flight_simulator_20_xbox_one_release_date43xfs.pdfIn PDF document text
    • http://canonsburglake.org/gofuzolukopozekumoluxalim37em.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/h9ihih1/free_music_download_for_android_phone.pdfIn PDF document text
    • http://onlyforyou.space/62049392260jznx7.pdfIn PDF document text
    • http://uk-delfin.ru/black_owned_ice_cream_shop_nycwyo09.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/koseledilo.pdfIn PDF document text
    • http://dutov.org/14249013072cq6e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_a51ce3b45be746169dd7f2ac4262dcba.pdf?index=trueIn PDF document text
    • https://0978d23c-7b87-408a-b4ab-ff16da0dae51.filesusr.com/ugd/369d68_02de529e66a94efb8d9df584974cadf7.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_29eefe3b046a49768d39f4e1ade01da2.pdf?index=trueIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_378acb1214a44e1dbb80ea3f5d37edb1.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_fdf56cb4fc4a418da77feed36c1713af.pdf?index=trueIn 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_off000153fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FD 5372 bytes
SHA-256: c653c313d301132ad1006217f78d8f7a5130b0e635246f56d773e80ab7af0b5e
font_01_sfnt_off00016653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16653 12216 bytes
SHA-256: 7d79002d14e9b2500f41a1d26907c9eed1bc4651326b3eb0d167cbf92a996a5a