Malicious PDF — malware analysis report

Static analysis result for SHA-256 882656209281647b…

MALICIOUS

PDF

69.2 KB Created: 2020-11-11 02:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 942bc3720c72140e610685f18600a07e SHA-1: 98cd543bacde5d48a6f120642a281d956826e56b SHA-256: 882656209281647b4681690b71e33e324ec0b1757dc9b80d5fd1b1787cfed4b4
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many of which point to a redirector URL designed to host a link farm. The document body text, though heavily obfuscated, contains keywords related to a school website, suggesting a phishing or social engineering lure. The primary malicious IOC is the redirector URL which likely serves as a gateway to further malicious content.

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://trafffe.ru/123?keyword=sphs+high+school+website PDF link annotation
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/tenudirola.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/d17b9feed12829b.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/233ccab07d0.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/xukonakefules/villanelle_novels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf99381-45f9-4d6a-bbe1-aab874f3c383/kojuzexubijegemexelito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fdc8b0-d228-4097-af05-c3b2ecb46005/scholarships_in_sc_no_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/15965186683.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/worksheets_for_skipping_counting_by_5.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/bagixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b53efc-fac1-4400-9dab-1ad8eadba168/thin-layer_chromatography_analysis_of_caffeine.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/63609195310.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/72791763899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9ab0af-c046-4278-a903-b5c56e4171ca/dobozogodeneburojubijixe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 5224 bytes
SHA-256: af0aeb0d9784979fe92c024e1e263147c0b6048b6ae01023980ce8c42e3194e3
font_01_sfnt_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 10820 bytes
SHA-256: abf3df4d76c643a02306a2a3665804126934744f957485a055d1bd9bd39f6f09

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