Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a2fff3d1cb332f…

MALICIOUS

PDF

68.5 KB Created: 2020-11-23 16:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4302d61038df0fc78c931e2da3e23248 SHA-1: 1d385109698ac8c413067728b3de1f4ac41aeaec SHA-256: a1a2fff3d1cb332fbb224451c7f9416ba59e57c1f78d16fc210250c35c4c7868
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to contain metadata related to a study guide, which is likely a lure to direct users to malicious URLs like 'https://traffine.ru/123?utm_term=1920s+test+study+guide'. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=1920s+test+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5f9e1e86d803b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_5fb50e9f5f50c.pdfIn PDF document text
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/xubag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_5fb744c9e3a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_5fb6d38d51ff3.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/jamokaroxoj/holt_mcdougal_algebra_1_online_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/mama_do_you_love_me_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0234bddb-cc9d-43d9-876f-2272777d536a/joker_tamil_movie_online_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/coca_cola_chest_cooler_models.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/62478671222.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/ssf-6_silver_solder_for_sale.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_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 5144 bytes
SHA-256: f6035f49a9c53ea61465fc69380acff9e26fd6308805fe320aacf2888de0a403
font_01_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 10104 bytes
SHA-256: ac849056d857cf1e99565b6e84de5df378cf9d05dbe2537dea9eb9f291918912

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