Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feeddc073da183f…

MALICIOUS

PDF

66.3 KB Created: 2021-02-19 20:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7f8a0a75f5bc2814a588c7d0143d8f90 SHA-1: e01166c3107d6b393f7d9b71f16a033a0867af85 SHA-256: 5feeddc073da183f0801942d77c93cd073c6d22233f4042a49e587387d4e6e70
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged for containing links to known malicious redirector infrastructure. The document appears to be a link farm designed to direct users to various disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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 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://crophysi.ru/strik?utm_term=tcp+ip+protocol+layers+in+hindi In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445125/normal_5fd67fcdb2f9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467298/normal_60017ee93ebb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_600b02cd4a744.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/918525e5bba.pdfIn PDF document text
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/1aa793108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505839/normal_5fd7885fe1dd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426085/normal_600538a90eed9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5ff00abbaeafb.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/kaxonodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413707/normal_5ff7756188270.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/ef0c55116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ff22fb033b6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370263/normal_5fcb48fa423bc.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/latetirur-sofavejokekum-xunizomobe-febokipal.pdfIn PDF document text
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/1972457.pdfIn PDF document text
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/kapib.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jhGePnA/how_to_raise_a_child_with_mild_autism.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/sumesawoxajew/introduction_to_boundary_layer_meteorology_stull.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_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 5212 bytes
SHA-256: eb2095bdc06a2305c0a9e622f9b7b1ff8ca6f02ee0ae508d2d98cda5baaea6f4
font_01_sfnt_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 9776 bytes
SHA-256: 974ba86731bd95acc3f94711cf43eac5946321df5a660988842ac169ab30a2da

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