Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a37e1fda5e0324…

MALICIOUS

PDF

71.3 KB Created: 2020-11-22 01:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 005f6951814d3b79cdf817ef1bcf9a9a SHA-1: 1ddb03a74a538cbafb7ff50704298dd1ec03ef20 SHA-256: 19a37e1fda5e0324b88afaaa0a6c9f7914aeaab850f5c91d08b2ba4b7e80dfd7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to 'traffset.ru', a domain flagged for suspicious activity. Heuristics indicate the PDF functions as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/aws?utm_term=on+time+performance+flightstats
    • https://pizojiri.weebly.com/uploads/1/3/4/6/134651663/4070453.pdf
    • https://rutujuxifir.weebly.com/uploads/1/3/4/6/134632780/rorewogazibi.pdf
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f9117f9d5ffb.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/sozudepalowaxeneb.pdf
    • https://kotevopokevunab.weebly.com/uploads/1/3/4/5/134590751/zegibolex.pdf
    • https://cdn-cms.f-static.net/uploads/4484618/normal_5fab9e641e98c.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/2186812.pdf
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/zezixewijufe.pdf
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/bugaveposamupeke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e314cc2c-d21b-481d-9536-8ddb76b7fee5/1598076520.pdf
    • https://uploads.strikinglycdn.com/files/36823f40-1c24-4a55-9d00-b31c03973f8d/71559709366.pdf
    • https://uploads.strikinglycdn.com/files/4768ecf5-7fc3-499e-bc1c-3a9bd4580633/skb_ps_45.pdf
    • https://uploads.strikinglycdn.com/files/9a5c9353-431d-4567-9752-8467059bb254/sociology_matters_6th_edition_download.pdf
    • https://uploads.strikinglycdn.com/files/58752b09-d83d-4092-972f-5c3a1bd3990d/91078689979.pdf
    • https://uploads.strikinglycdn.com/files/a13d5e4c-123b-4048-ba41-2ddda44efe37/quadratic_formula_word_problems_worksheet_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d411.bin
18fe802e2bf95f2216a64f392d0e7635ec2570ed1798259dacde28e9cbcfeb08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 5456 bytes
font_01_sfnt_off0000e670.bin
d273d11c6353805f698e0d8d057d95a4736d84df6d23a105d6d3aaa074ef00c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 12872 bytes

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