Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc122da527e327e1…

MALICIOUS

PDF

80.2 KB Created: 2021-05-01 06:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2fb5d998b9546c75ee241de348b3875d SHA-1: a5e07a80be41ec5a4f35b00d644bacd15c84053c SHA-256: dc122da527e327e1b8381235631548df560ad9291c64d187aaeb8cac453dbed2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://resalured.ru/strik?utm_term=can+exercise+cause+low+iron+levels. The document body, though heavily obfuscated, contains text related to exercise and iron levels, suggesting a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=can+exercise+cause+low+iron+levels PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450421/normal_6034010224771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_603d615031106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_604ceb8d97beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_601ec594cde2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_60388c463ae49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460070/normal_5ffabd61c8a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493200/normal_60568e076e354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_600c14df703ca.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/dawulijoxuxatuzibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5fd21f99d60d4.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
    • https://s3.amazonaws.com/gopuze/nexag.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/best_convection_oven_to_buy_in_india.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_b7f57d3da68e4dc4aaee60a07becacd0.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_9d2ecd4a4bea43b298e7b8ee228ca7c6.pdf?index=trueIn PDF document text
    • http://xijejuvi.myartsonline.com/regimento_da_assembleia_da_republica_de_mocambique.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_85b174346aa7485bbe8218cc68e71e90.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_dd9f082aff9242738fe22d7def1ca0be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/sedanotaxaximige.pdfIn PDF document text
    • http://lolunoxij.myartsonline.com/illinois_vehicle_bill_of_sale_template_fillable.pdfIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_a00e8c31efac43e3a7a8fade4aaf5a17.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_906199f350924191a86a3a603a08ea45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/damerirazib/72839941781.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_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 4840 bytes
SHA-256: 36c0effd3bd4a728e8b810a49aaa03b10d5c680588caf9868990223e549cdc76
font_01_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 10632 bytes
SHA-256: 17c5bc7bc2368c197ffadc3af5dabbaa5b5b74c4c9ab549c3f44e861057196c8
font_02_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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