Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae77f7c3a794da1…

MALICIOUS

PDF

79.4 KB Created: 2021-04-17 20:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02dac87accd950d967abfd7b4b0b5a9f SHA-1: 5f2bd675dafe98f4596957efddff669e514855c5 SHA-256: cae77f7c3a794da1ae227ceee406bc2c4db6dcdfbf86377bb6af1e33408add66
156 Risk Score

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, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains a URL that aligns with the 'link farm' heuristic, indicating an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=how+to+start+road+to+hana
    • https://cdn.sqhk.co/muligumixe/eYyzgi0/fofepivatigesufol.pdf
    • https://wesobopaforok.weebly.com/uploads/1/3/5/3/135311180/f9d6747991ace.pdf
    • https://cdn.sqhk.co/wenejusuzixe/gj2hfij/go_launcher_prime_remove_ads_apk_free_download.pdf
    • http://vovality.club/how_to_use_amazon_echo_as_an_intercompunyw.pdf
    • https://cdn.sqhk.co/gusejemife/aeCjalh/27425191413.pdf
    • https://rikinosi.weebly.com/uploads/1/3/4/3/134352476/bc460b4278.pdf
    • https://cdn.sqhk.co/sepokafaru/eheXtsN/putozusogagusizo.pdf
    • https://cdn.sqhk.co/kijowevo/ggdohaV/karnataka_budget_2018.pdf
    • https://cdn.sqhk.co/bexamajuw/iihfjev/rafusedepiv.pdf
    • http://hugertely.xyz/658912059354gnqa.pdf
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/saromugi_gufasamozebagif.pdf
    • https://cdn.sqhk.co/vekuperik/iheP0hd/i_want_to_talk_to_the_manager_karen.pdf
    • https://cdn.sqhk.co/tovozovuzedu/iehc9gp/6220314924.pdf
    • http://comforfemj.fun/bell_hooks_we_real_cool7m62h.pdf
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/e46e66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6431df7-02b9-4bfa-8694-655c83cdaff1/walmart_grocery_store_address.pdf
    • https://uploads.strikinglycdn.com/files/725f5249-ea85-4282-acef-f4f1569f626f/insinkerator_garbage_disposal_home_depot.pdf
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_eba9bc90bed343d0818ddf56bce035ae.pdf?index=true
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_d0bf43e29735421982bd97c7790612f0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/edb1f206-19f6-4dc9-8250-3b10e5a6492c/48268217144.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_off0000fa5d.bin
6ff7f81e6a076c464b30536f175f6be3799ae9bc92498e7ccb79fd086228d3b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 4936 bytes
font_01_sfnt_off00010b29.bin
b5fd32e7dda8fa7b56d07fb8ae50417a023a39073fa48606bf493b73048db097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 10944 bytes

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