Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c90ec2cb18389a…

MALICIOUS

PDF

144.2 KB Created: 2021-03-15 23:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 372c2cc4bfecdacab1dddcb5048059ca SHA-1: 0775c0c8e894d835fbfac337711e1a4aea11c4ce SHA-256: e7c90ec2cb18389a3943c8aabfe164cf4c7f62c56673f0829ed8dadbdaf640a7
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 of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malware or facilitate phishing. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest this malicious intent. The document's primary function appears to be directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/wix?keyword=biochemistry+macromolecules+worksheet+answers In PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/drug_delivery_systems_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450040/normal_6049f1fa2d632.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/que_es_el_atomismo_logico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5ffb842ebe7b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_603c0e396fad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_604a9f4da8a7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452588/normal_5ff88b4535a7b.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
    • http://tiluxusimutine.atwebpages.com/nawekivinalun.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_0b4119df1a7847feba913badca41f7d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/venovewilikixagetamonome.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_8d03a362ce89444ba349e4ad405a75c6.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_e17fe3d057434c9681acc34b65e16513.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/somiguwezesegemepalal.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/lekutezedivola.pdfIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_cc596b9ad6ef4aea87a78d6fbf7b18be.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_87b72efd91e448098a68eaafdb103e1a.pdf?index=trueIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/masterbuilt_sportsman_elite_gas_smoker_parts.pdfIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_d675d88797394c9c9282af2c0963cec5.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_c003cac6da8644cb881dc6b0447f1873.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/remexexujemezipexevad.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_6b5ef1c529074557ae83a8009ce2b998.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/kuzaja.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_off0001eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAB3 5228 bytes
SHA-256: b5ec920cfcb2a88aca9e754c051a4995c8ae8c996b203940ba07e95ea97c66d0
font_01_sfnt_off0001fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC5D 11892 bytes
SHA-256: c9bc3d01a7865fbdb0d07399deac7d04620bfe495136e46dc6e153422c7787d0
font_02_sfnt_off000224c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224C7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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