Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ff69e55805dfa1…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 11:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49030642325edef900bd225803407262 SHA-1: babb777ee0327d97b1478cd55359532faae04188 SHA-256: b0ff69e55805dfa1337270098e3948d2fe8d1239916674dad2ada27a4a08b9b7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicates maliciousness. The embedded URLs suggest an attempt to drive traffic to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://nipisod.ru/strik?utm_term=beccaria+on+crimes+and+punishments+book
    • http://budonap.iblogger.org/shazam_app_free_apple.pdf
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5fd11b6e79a7f.pdf
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5ffbcfbb4d81e.pdf
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5ff5b965126e3.pdf
    • https://cdn-cms.f-static.net/uploads/4495254/normal_5fd1db003fa8f.pdf
    • https://static.s123-cdn-static.com/uploads/4428329/normal_5ffb8c503b07b.pdf
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5febb5c6bfa7e.pdf
    • https://cdn-cms.f-static.net/uploads/4485801/normal_6037c7f484e0b.pdf
    • https://static.s123-cdn-static.com/uploads/4376379/normal_5ffdfb3f98ff0.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_6030faf22828f.pdf
    • https://cdn-cms.f-static.net/uploads/4403533/normal_60203f7cb48cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jovekus/flir_infrared_camera_one_pro_lt_ios_test.pdf
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_fbb0f43842474d66813fde8f9a6bb626.pdf?index=true
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_15efcd4a852b426bad0b569d8e66c58b.pdf?index=true
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_fd9b43815af147109c7b328f01043441.pdf?index=true
    • http://koxepari.rf.gd/fabriano_paper_sheets.pdf
    • https://s3.amazonaws.com/nilafafakem/38572423031.pdf
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_3c2d348e79b54f03a6b94d10e10bec1e.pdf?index=true
    • https://s3.amazonaws.com/lijopavexanuse/casualty_feeder_card_form.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_f34b06bd863b4dcfb0037b3bdcf6e4f2.pdf?index=true
    • 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_off0000ef6e.bin
792a3e13abdb32f3bbca4fd0213df7955114cdfac741dbb2d8eaebb95283c3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 5536 bytes
font_01_sfnt_off0001020c.bin
d2309b94ef4345350a40d0340093e654b652760cab3664e02488ff10e1491786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 11244 bytes

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