Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a7e4bd30ccdd41…

MALICIOUS

PDF

81.8 KB Created: 2021-06-08 03:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1e0c3aff9d059d7ecbb0c484c094565 SHA-1: e10abd701e8031888a5a11883f2d8751f1f13496 SHA-256: 50a7e4bd30ccdd4122ff653e26a6cb972269e30c1170061769e6b88f8dc224b8
186 Risk Score

Malware Insights

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

This 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, many hosted on disposable domains, suggesting it functions as a link farm or SEO spam document. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://pistant.ru/pbw?utm_term=como+se+dice+buenos+dias+en+nahuatl+wikipedia
    • https://novenoberube.weebly.com/uploads/1/3/0/7/130776641/rujar_puvatisotufi.pdf
    • https://kulaxebide.weebly.com/uploads/1/3/2/3/132302774/8936249.pdf
    • https://gifoxulexup.weebly.com/uploads/1/3/4/8/134865115/02d74a.pdf
    • https://static.s123-cdn-static-d.com/uploads/4405925/normal_60afe7dc5baa3.pdf
    • https://cdn-cms.f-static.net/uploads/4468820/normal_605f7aa86cbc9.pdf
    • https://jasugupaxawuz.weebly.com/uploads/1/3/0/7/130740610/5214717.pdf
    • https://static.s123-cdn-static.com/uploads/4390382/normal_60097bd28db86.pdf
    • https://gifaxefapi.weebly.com/uploads/1/3/4/5/134598377/3116615.pdf
    • https://cdn-cms.f-static.net/uploads/4391621/normal_605d6698d365e.pdf
    • https://cdn-cms.f-static.net/uploads/4413457/normal_601fffe39957d.pdf
    • https://static.s123-cdn-static.com/uploads/4490961/normal_5ffb78f97c48f.pdf
    • https://cdn-cms.f-static.net/uploads/4388272/normal_604421d53edd1.pdf
    • https://puxomesepose.weebly.com/uploads/1/3/5/9/135977076/womutokilubat-lakuzowuduf.pdf
    • https://static.s123-cdn-static.com/uploads/4384028/normal_5fdff7e7c9ffb.pdf
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/2064901.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e9249b0-9e6c-4a88-8e85-d3674c5ae6d7/49148324579.pdf
    • http://vulazojab.pbworks.com/f/opera_browser_for_tv_apk.pdf
    • http://wigonewakil.pbworks.com/f/49339735782.pdf
    • https://uploads.strikinglycdn.com/files/fef786c0-1568-472f-9611-40f67ed57c1a/asus_p9x79_ws_cpu_support_list.pdf
    • https://uploads.strikinglycdn.com/files/97bedb6d-4445-4f43-bdba-4b3c4cee170b/rokefe.pdf
    • https://uploads.strikinglycdn.com/files/9d267de5-4d21-4924-a4ca-f0088440124f/is_wendys_mayo_dairy_free.pdf
    • http://nosiravuga.pbworks.com/w/file/fetch/144445182/how_to_get_unlimited_coins_in_subway_surfers.pdf
    • http://jumogitakos.pbworks.com/f/how_to_write_a_reflection.pdf
    • https://uploads.strikinglycdn.com/files/c3b0e7dc-b2ac-4b7b-b2bf-cf1b1df1828b/dd_players_handbook_4e.pdf
    • http://nosiravuga.pbworks.com/f/fifirumaniwefadedix.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_off0000fcb4.bin
aced955071be1967597d1e6a0134cbb13b8222ca32050ecd93e348d669ef7b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 5420 bytes
font_01_sfnt_off00010f04.bin
ed8f78731dee97f5e1e73392d53e1abb30d6cb6a2afcab90ac7225db4a9b8879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 12816 bytes

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