Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f6ddab990b45ad…

MALICIOUS

PDF

78.4 KB Created: 2021-03-11 03:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7a2ac04e7e9d0c767013d5d62b356613 SHA-1: 06560f09b93115a373fa055cc10f2c70d69d4baa SHA-256: 18f6ddab990b45ad3e7efaa2bb707654bb97e7ca67991d26fd8d6826fe5a6151
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'air borne diseases' and is likely a lure to direct users to malicious or spam content. The presence of numerous external URIs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=what+are+the+examples+of+air+borne+diseases PDF link annotation
    • https://tazegeravi.weebly.com/uploads/1/3/5/3/135390309/faziv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502439/normal_5ff09d5d9c034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413469/normal_5fcaf549c40fa.pdfIn PDF document text
    • https://mobofapewapo.weebly.com/uploads/1/3/5/3/135399527/3358455.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/92627151438.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/favola_amore_e_psiche.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/nudubuparugorimoxitixiter.pdfIn PDF document text
    • https://mebevoluw.weebly.com/uploads/1/3/0/7/130739105/6266948.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/kavugusepe/jio_play_store_app_kaise_kare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2222389b-821a-4e44-b934-26be4b265dc0/91954880378.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_7753f087d3eb43eca829a3f8c6839951.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_5b88d9d2c9754de7894cd7d1da609cdb.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_0dbcbde5a7f442dcbaf81e13c4cc3818.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41d57ca-07e0-4332-92e3-797c0a84d33a/reset_pioneer_sph_da120.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/wafigejikimavovanutower.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/folk_and_pop_culture_ap_human_geography.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/78574354278.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/my_cousin_rachel_book_plot_summary.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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 5500 bytes
SHA-256: 912fb9470fa4b4cdea044c65111c503801153c9c9b6b55b429b4bedff3e64cd8
font_01_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 10676 bytes
SHA-256: a03b31d456bffb2223539021b85776aea6c116fa2cb67ae7ccaf88dff8bc4a5a

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