Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a113200dbbef4c…

MALICIOUS

PDF

85.8 KB Created: 2021-02-12 21:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ef585964e70bfe4905bdfd571861e8d2 SHA-1: 93cb069897a6458c66c4f72e36725d7e1776f64a SHA-256: 78a113200dbbef4c6f35c8c997ef7beefb3c1a3b7b717692ae0791bb0520f43c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results for various topics, including books. One prominent URL, https://baarspo.ru/wix?keyword=miss+manners+guide+to+excruciatingly+correct+behavior+pdf+free, suggests a lure to download content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/wix?keyword=miss+manners+guide+to+excruciatingly+correct+behavior+pdf+free PDF link annotation
    • https://cdn.sqhk.co/miraroki/h1jchcV/47257992471.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/dggidZ4/3_doors_down_away_from_the_sun_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_600aeebd5f86b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_5fcf38fbe17eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452169/normal_5fde68c2d2d8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fe912a47b2d4.pdfIn PDF document text
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/36130a824b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_6005a9fc1a55e.pdfIn PDF document text
    • https://fafovufurivu.weebly.com/uploads/1/3/2/6/132695925/kuvago-genozidegubaxug-demakagibuli.pdfIn PDF document text
    • https://tiwidugeges.weebly.com/uploads/1/3/4/6/134635585/kogesorakasego.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/kugorunope_kimax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_601d982b3bf4d.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/bubeto/analogical_reasoning_report_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/calibre_convert_kindle_to.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/cats_king_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/bittorrent_pro_onhax.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/utah_dwr_fish_stocking_report_2019.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_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 5944 bytes
SHA-256: 9bbabb5915fa8e6aa681178f10adbefcd981b91be4822b485ac7995c92327422
font_01_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 10720 bytes
SHA-256: b0a3b6ac9a728b2ce1f4b218cc96693bc8ab863ac17ddb881216f4ce62788a2b

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