Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32200c6566fac97…

MALICIOUS

PDF

75.5 KB Created: 2021-03-22 13:58:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c14b9465566293d63737afdacb7831c4 SHA-1: 4aadd2d9877bd5f06f509c9a48afc84542dd9885 SHA-256: d32200c6566fac97a66eec8c83fcd9f445cf409ff33e0e11824d745314c4fe9b
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable hosting and potentially malicious redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to sites hosting malware or engaging in scams. No scripts were extracted, but the extensive link farm is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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=nyeri+pinggang+pada+ibu+hamil+trimester+3+pdf In PDF document text
    • https://xabomipa.weebly.com/uploads/1/3/4/4/134484571/ramibamugesupuxaf.pdfIn PDF document text
    • http://es50off.pro/desonaredediwojiguxyqdw.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/f5cd2d21f47c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425908/normal_60013536b83cd.pdfIn PDF document text
    • http://profer-opt.ru/sword_art_online_season_3_english_castrntjy.pdfIn PDF document text
    • http://watercart.ru/greatest_salesman_world_10_scrolls_summary5p4cw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_601f998511b58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_605040392211c.pdfIn PDF document text
    • http://qlemelest.online/36642517076h2t4d.pdfIn PDF document text
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/b1b61c330896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fdb75cd7cc47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_600e863f43242.pdfIn PDF document text
    • http://aires.fun/stairway_to_heaven_korean_drama_quotesgte43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365586/normal_6001cfb21b918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_603a288e46159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_600f0b694932c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_02cc4ce2cdb24022b20060a8cb5b995d.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_9189378cd79d4d2b97fc3bd1906c99f1.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_8ad5df201abf4f3a9e52cca0eb3ee0c0.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_482268985fb84678a94152096eddaf79.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 5828 bytes
SHA-256: 16829baee56033891f452a78ae5fdd4bcb155b1b39e2d46368823a830c918fd7
font_01_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 10876 bytes
SHA-256: b2ee00ade755ff1ab019c15269a6f49f1f0f27be806a7fecbfec3e0d00f2093d