Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a8ecc404932131…

MALICIOUS

PDF

82.4 KB Created: 2021-03-22 17:29:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6f073f05c732fcd1a22a021032a918ca SHA-1: ed9e6ebedadd2ba6cc45d674ee820b02f93093be SHA-256: 51a8ecc40493213102e40015b89e817f0ae967e43a00328245e9b75de926d75b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=analyzing+a+poem+worksheet+stacey+lloyd+2014 PDF link annotation
    • https://cdn.sqhk.co/nawafoxobok/XhehiGx/tipinisazotufukusamana.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/they_say_i_say_3rd_edition_chapter_4_summary.pdfIn PDF document text
    • https://vefiwuzozubeki.weebly.com/uploads/1/3/0/9/130969791/sasinunevidemov.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/higdc2g/pujixatamiro.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/nfMiigf/10498146265.pdfIn PDF document text
    • http://abanca-electronica.com/fepumubibcev8.pdfIn PDF document text
    • http://tekdouche.xyz/asus_x553m_bluetooth_driveri6393.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/W9ijVji/21888094669.pdfIn PDF document text
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/wugarutorifonuru.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/fasomusogapovi/mamixepugakabubog.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/abstract_page_example_apa_format.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/25499453121.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/getigu.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/dagujemunobevuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/38702102350.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 5988 bytes
SHA-256: 7b82577895812c79addc8769d2249076328b2a7019a1a08253923e37395df394
font_01_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 11612 bytes
SHA-256: abc72ed9c9f36886e06164d1a3676fa81c641e7e1dd1a7488a7b320485eb48c2
font_02_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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