Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8a52fa718f7d82…

MALICIOUS

PDF

87.5 KB Created: 2021-03-01 10:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4d9facc3e50fddcc9bf0bdd792d2d5b0 SHA-1: 711ea92d5b7c364853d6ef3c3cb3807f13a3689e SHA-256: 1c8a52fa718f7d82a41e30c99e4bb5cf2db2526e231e81d49a0915c027105195
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs, such as 'https://resalured.ru/123?utm_term=can+you+bake+biscuits+in+an+electric+skillet', suggest a phishing or SEO manipulation scheme.

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
  • 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/123?utm_term=can+you+bake+biscuits+in+an+electric+skillet PDF link annotation
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/92a0f2702fb13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_60217240adf89.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/cjgjLgc/the_world_ends_with_you_anime_website.pdfIn PDF document text
    • https://cdn.sqhk.co/bezugisav/WyRZNib/godarumifoderidap.pdfIn PDF document text
    • https://cdn.sqhk.co/jawosuzexe/KQgcqgg/xafidijexitovalisexute.pdfIn PDF document text
    • http://dolijajoz.22web.org/introduction_to_mastering_physics_answers.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/mekilazosewefelov.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/f7jacLm/14134704019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fd6374a9b526.pdfIn PDF document text
    • http://vexawenebo.22web.org/fetinusutugizatufeluluj.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/aBHpKgc/subixatesoror.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/vawoginele/friendship_day_2019_songs_tamil.pdfIn PDF document text
    • http://zamasadexemu.rf.gd/vunagix.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/82866796869.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/19797979892.pdfIn PDF document text
    • http://xonifovozub.epizy.com/apush_dbq_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/49255187892.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_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 5004 bytes
SHA-256: 3668f774443869f2039deb1d4c74ab2b2d3422cf7139458f61cb6414af96e18a
font_01_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 12132 bytes
SHA-256: 18e803d2b004eb5920ee6ad434f6a2f74e2cfabc5349b9d174a6f556c45c9d48
font_02_sfnt_off000141fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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