Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63a46c580fcba04…

MALICIOUS

PDF

79.9 KB Created: 2021-04-07 08:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 302bd61b1750cdafc6cbbd9622063be9 SHA-1: c332ceaff4b858728e4b98bd6998ce564205ba64 SHA-256: b63a46c580fcba040e45fab77bd32ad3d80c9ec8cf59234617f8429cb84288c2
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/award?keyword=catering+services+business+plan+pdf In PDF document text
    • https://cdn.sqhk.co/kapidibewomu/Ec9jawe/you_hit_them_all_bible_verse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_601cb2e1261ce.pdfIn PDF document text
    • https://cdn.sqhk.co/zarudaletok/ygd6icE/19343079303.pdfIn PDF document text
    • https://rudetotupolukoj.weebly.com/uploads/1/3/2/6/132681245/846918.pdfIn PDF document text
    • https://kezugavamatuwe.weebly.com/uploads/1/3/5/3/135347357/287215.pdfIn PDF document text
    • http://laserisesiseno.getenjoyment.net/carburateur_auto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491688/normal_5fc6d06ae2f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_6032f7e22ab7f.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/63jcVG8/algebraic_properties_of_equality.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_604ec254216ce.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/dutozo.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/hjiAhbc/jubezidepoxopa.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/words_that_start_with_a_to_describe_a_feeling_of_happiness.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_604b49d077b84.pdfIn PDF document text
    • http://lirifajo.sportsontheweb.net/bekezudoranonigenobo.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/hfjhVhb/divejupajewofadebaxud.pdfIn PDF document text
    • https://galujamisone.weebly.com/uploads/1/3/1/8/131871568/440fb546e9d254.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/kawotexulozax/lidexetuz.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/bizinixu.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_55d54a5124fe48fdb06e1eb4389c77e9.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_0b3da867b3664c388f1e7b404771a0dc.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_f95adf7347ae410198274ba6da61805f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/febopa/59988588170.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/peterbilt_579_service_manual.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_7cbe644083cc480891b2ef5b19c8944e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusagi/12560137900.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_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 5428 bytes
SHA-256: e45f27f9320fb8676cc3798626334128b8d5002cc9900edb46066d0c0e0141f5
font_01_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 11396 bytes
SHA-256: b9b86da450d2bddd798185f505f7692ce16fab7e7fe5d0099e5fff6fc1ddf932