Malicious PDF — malware analysis report

Static analysis result for SHA-256 23443b4eaa5b4b9c…

MALICIOUS

PDF

78.9 KB Created: 2021-03-13 21:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bbf253cbf7a292a633d91c2f8c1c778a SHA-1: b02613071ae1f21896cd7a86ffe3b29266ab2645 SHA-256: 23443b4eaa5b4b9c38db3a215e9843896339baa225ca42b0962dc8d001603d92
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as an SEO link farm and a high heuristic flagging it as an image lure linking to an SEO redirector. The primary URL, 'https://golowaki.ru/wix?keyword=phonics+dance+alphabet', is associated with this redirector. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/wix?keyword=phonics+dance+alphabet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486061/normal_5fcf303176c43.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/YtqheOi/2712597708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420028/normal_5fed4a1307106.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/3135235.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/lisuxoz_zopetifuwaba_bekatovigul_fekokaxilelodi.pdfIn PDF document text
    • https://cdn.sqhk.co/zogaxokeno/gi9OjhM/calendario_contribuyentes_especiales_agosto_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368735/normal_5fce2f8669980.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/1655192.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/4943e4d0f090b4a.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/E8jgYjj/universe_25_experiment_homosexuality.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/a081a661c4e.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/jdAiaEb/potiwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_5fe36df10fd26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_600c724c16aa6.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/dRfCrFN/paxenizamogadi.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/rorives/17422017980.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/parquet_courts_human_performance_blogspot.pdfIn PDF document text
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_f4fd185c4a204017bd1edfede7e35e34.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_980bbd53f00a4b709980068b6552d60d.pdf?index=trueIn 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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 5208 bytes
SHA-256: 3b3c70259d7f9df3efd5aa0236b0462461b1ec508f4a33921263182e41635c30
font_01_sfnt_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 11652 bytes
SHA-256: 146fad0fc9c32d3ee3bf68c77df0b8e7f42e03f5b96a56e14da3791e96e1daa8

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