Malicious PDF — malware analysis report

Static analysis result for SHA-256 1840ce9cff62c344…

MALICIOUS

PDF

73.8 KB Created: 2021-03-13 18:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0e0d2497b36c634e8cc53238d78ec42a SHA-1: 4bf454bd5d2f3d2c58353e8f744b241395af171b SHA-256: 1840ce9cff62c344202d403d03d3a2157653e7c4273dc0bc3d9fa88f47e7c552
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are identified as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/wix?keyword=aha+acls+manual+pdf In PDF document text
    • https://cdn.sqhk.co/dabozijide/f5ienhj/dozitobub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377380/normal_5fe502640446d.pdfIn PDF document text
    • http://maewallace.com/89254556627zxa2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_603c60cc5da27.pdfIn PDF document text
    • http://foyou.store/how_to_argue_like_jesusp49yb.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/tafobenugovixelufixojejek.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/11230118932.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/kiiEHf4/74316983634.pdfIn PDF document text
    • http://finonit.mypressonline.com/kakuzebiporizomogoralikil.pdfIn PDF document text
    • http://immorta-cross1.club/jirovem1rsuq.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/lulozekevuz.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/hjc3Shc/mudofajuwuvubadojif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_60143bb482ee5.pdfIn PDF document text
    • http://mpvideo.org/352518158737oiya.pdfIn PDF document text
    • http://cashtanks.fun/kavanaugh_report_shelves0wleg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462376/normal_604acbee3017d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501046/normal_5ff2e28070390.pdfIn PDF document text
    • http://hhizmet.com/how_do_i_fix_the_orange_flashing_light_on_my_canon_printeroig4q.pdfIn PDF document text
    • http://umkatrade.ru/wekobagerugotovijizpm7bo.pdfIn PDF document text
    • http://spainwow.pro/how_does_god_comfort32y1t.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/gigFhgi/w3layouts_login_templates_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifobem.myartsonline.com/smith_and_wesson_model_915_factory_magazine_for_sale.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_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 5288 bytes
SHA-256: 6b51671115447ed6e4d2422db43c0f861694dfc7a07227f4855952ed503798e2
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 10980 bytes
SHA-256: d26acad782309c5395e0767a51ee35248a479a58d4f7a567e100f682dc97a10c

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