Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a8b1711a4b2880…

MALICIOUS

PDF

112.0 KB Created: 2021-05-28 22:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 38f10e61d73f8ae7920ce715799c0591 SHA-1: 0b3522f076fb5c1fdca8a3cdb5a4cc4e296ad22d SHA-256: f0a8b1711a4b28801f7b8ba58fd602f011a479d9ffe484d668b3ef3cc8fac63c
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, with one pointing to a suspicious domain, suggesting it functions as a link farm or phishing lure. The embedded content is heavily obfuscated, preventing a detailed analysis of any potential scripting, but the overall structure and heuristic firings strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=personajes+del+cuento+el+gato+micifuz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488315/normal_6008274d68dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_6042c4a096d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_603e52738a9fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fd7f1125c57b.pdfIn PDF document text
    • https://wevoforu.weebly.com/uploads/1/3/4/5/134591306/767983487f32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478438/normal_5fcc96194de93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_6017ad7c55503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_603a15e22dc46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_6069205fae0fe.pdfIn PDF document text
    • https://lirurarupo.weebly.com/uploads/1/3/4/7/134770738/dfe02564.pdfIn PDF document text
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/sugorinofonif_dewupotabivubu.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/wadiruteg_gevexumezis_kaduxujufubu_zezerexojowoxab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487005/normal_5febbb123c875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fd0ad9028989.pdfIn PDF document text
    • https://rizamarorupewug.weebly.com/uploads/1/3/4/5/134527102/0c216836de84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_603aaa63a85ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53f6b09-f921-474d-b28c-cab91773389b/90008336424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bdc19d-f750-4b16-bc33-e3ef09d01f2d/can_you_make_pizza_dough_in_a_kitchenaid_mixer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd71b9c-6951-44ad-90eb-ba3e45c62553/xopulolef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e47a5b-6af6-4714-afff-32c6892331f4/the_alienist_season_2_episode_1_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b3eb4c-bd67-433c-bd56-13c5ada797a2/neoliberal_governmentality_foucault_on_the_birth_of_biopolitics.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBE 4932 bytes
SHA-256: f1168597aa447647ec707749bc66d5d8cf8d3585f17c4912c2990ab86bef0a4f
font_01_sfnt_off00016ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF3 5468 bytes
SHA-256: b423fb1e4f41d6b17a5a3965f480ae36af6f2f85f5263f998e129e51843ea90e
font_02_sfnt_off00018187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18187 14956 bytes
SHA-256: 424213f2d2c0355e64847425910fd63407e398d8ffdff4ab23f24c2af8e10910