Malicious PDF — malware analysis report

Static analysis result for SHA-256 31201f0499bb04f2…

MALICIOUS

PDF

164.4 KB Created: 2021-03-24 16:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c339b829be78e15de1bbf0989bb42da1 SHA-1: ad665b09e259400269d82277acfc29f5072231f3 SHA-256: 31201f0499bb04f2a36b0ee5038780306c1e4a0cfe9500d8a60120e6b9f83620
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://dafemum.ru/aws?utm_term=what+is+palmistry+reading In PDF document text
    • https://cdn.sqhk.co/zejejofe/qhajirP/viticulture_essential_rules.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/near_infrared_spectroscopy_principles_instruments_applications.pdfIn PDF document text
    • http://riwalimuj.scienceontheweb.net/bexovixugi.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/bsjjXjh/disney_movies_for_toddlers.pdfIn PDF document text
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/fasixepar.pdfIn PDF document text
    • https://cdn.sqhk.co/kopozufu/QifYbQ0/orbit_spinning_mill.pdfIn PDF document text
    • https://wujojebexubab.weebly.com/uploads/1/3/1/3/131380870/3703856.pdfIn PDF document text
    • https://cdn.sqhk.co/xipugonor/gViiojf/prove_angle_pair_relationships_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/Yjiyhfl/91060518366.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/toastmaster_bread_machine_tbr20h_manual.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/zizuxoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_16260de34c0540eea520577925f69599.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c798c10f-2d37-44ba-86d6-85b4b9c16148/what_does_the_term_dead_to_the_world_mean.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_5667af1db46545a9a6bdb1c445a47a66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc48050-b7d0-4623-aa69-b690936d0ee4/how_to_show_data_labels_in_excel_graph.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_2d7a3ecbd6cd466e84b2dad371229d3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a040bf8-f852-41bf-8806-38a84972a875/85218722597.pdfIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_447223ac265042cc8f6c2d9aa9402cc9.pdf?index=trueIn 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_off00021f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F68 9008 bytes
SHA-256: c28eba0aae9db722e1296bc88ec4e66abbcdac9df81093f001e0afe480a5718d
font_01_sfnt_off00023c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C76 5488 bytes
SHA-256: 3824a504e1f51ca3b4964ff316628fc114313dea9e1aea512f3328e22071d31a
font_02_sfnt_off00024f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F0A 17260 bytes
SHA-256: 5518e4ad30fc0590c44377fc46a97bab39e6b6dd3bcdc19a76b68f69aa3ce936