Malicious PDF — malware analysis report

Static analysis result for SHA-256 91abb3003af6e7f0…

MALICIOUS

PDF

76.2 KB Created: 2021-01-07 21:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c7155493f4fe251c873de329c158522a SHA-1: c5d9c810dcd9b62d3f7fdf90c70b6e6bb42894cb SHA-256: 91abb3003af6e7f0f38a1c8ccabc50fbcdff28f9fd7b632430b79f0618ce1154
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=routing+protocols+ppt+free In PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/tutejizejepakebulafa.pdfIn PDF document text
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/dozub_vamotujaxeku_javewurubesi.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/yMCsOhh/uber_driver_salary_nyc_2020.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/1001373.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/lujezamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f87db19088a4.pdfIn PDF document text
    • https://golobixapisiz.weebly.com/uploads/1/3/4/6/134653183/98fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_5fb49bf7e23f0.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/hhzibir/spinach_recipes_pasta.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/ifgcjfz/41163015515.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xozeb/96713422037.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/sanabaxonopepugoxowodo.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/beavis_and_butthead_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/rezojumogugo.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/metformin_hydrochloride_1000_mg_emc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03c6816-11f2-4f01-9b84-f8713780f481/marketplace_buy_and_sell_saskatoon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 4980 bytes
SHA-256: 8314dfffbf0e0559bc86609af477047fb6da60c8462a0e376ca390dddd997589
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 11144 bytes
SHA-256: 731987a628a53d1ae160f81c0a401ee9d550d6f0dbf875566e38309323e592e6

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