Malicious PDF — malware analysis report

Static analysis result for SHA-256 5629ed227cbd1aa9…

MALICIOUS

PDF

87.0 KB Created: 2021-03-03 15:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c50c275c8f51c83fab75bf6b3d2d5ecb SHA-1: ba798a9d99164ca07090576adbd080cc29183d5f SHA-256: 5629ed227cbd1aa90a49d1a33af2206294e8cc32bde88314d9d3885d451080ea
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are likely malicious. ClamAV detection and ML classification further support the malicious nature of the file. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly suggest a malicious intent to redirect users to harmful content.

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/award?keyword=what+do+you+mean+by+metaphysical+poetry+explain+its+elements+with+suitable+example PDF link annotation
    • https://zejabiforisog.weebly.com/uploads/1/3/4/2/134266870/6e9fbfcdcd045.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/5014871.pdfIn PDF document text
    • http://policyhelpcenter.com/density_practice_problems_worksheet_chemistrybz98n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_5fdc6f4f6efdc.pdfIn PDF document text
    • http://italdom.fun/xujakomivukipfajxv.pdfIn PDF document text
    • http://ttttrrrr.space/4644541862aqu0o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_5fd7f891e058c.pdfIn PDF document text
    • http://cesaregaspari.com/peparidiwud4zv5.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/81a937df.pdfIn PDF document text
    • http://segway-wheelchair.ru/916359935984e0z6.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/jasadavebaga/sleep_revolution_arianna_huffington.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/biwuranibozuwisoguk.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/gikibegat.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/besozorudo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/anjali_tamil_film_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/how_do_you_forgive_yourself_for_the_unforgivable.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/betsie_river_salmon_report.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_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 5728 bytes
SHA-256: e5ea53bebd67ea953aab3f23d07497b864906ae51b6ee191819e5c3f39a67292
font_01_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 10000 bytes
SHA-256: 17e3a436410820fab9b35cc5c691771a558157da1089f3544b1c6b760963b4fd

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