Malicious PDF — malware analysis report

Static analysis result for SHA-256 90057ce4071a3326…

MALICIOUS

PDF

62.3 KB Created: 2021-02-19 01:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e36a7503a2ba2c14d33256b5f828a294 SHA-1: 65bbd842a6f04800ca437f3ef104d1561fc4d4bd SHA-256: 90057ce4071a33269c0d6716463abc5394f5296c93f9da1fff2eb44cc2c9b963
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm. The document contains numerous embedded URLs, many pointing to disposable hosting services, which are likely used to distribute malware or conduct phishing. The presence of a malicious redirector URL further supports the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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/aws?utm_term=crossword+puzzle+maker+free+tagalog In PDF document text
    • https://kirugalepolofaw.weebly.com/uploads/1/3/4/3/134340862/e41e4f727.pdfIn PDF document text
    • https://zufesuvagudinaf.weebly.com/uploads/1/3/4/3/134321689/zadibi.pdfIn PDF document text
    • https://vesitunerenos.weebly.com/uploads/1/3/5/3/135338192/xulomi-dosibokub.pdfIn PDF document text
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/puzofaravixiw_fuxaligagafurob_gedivige_manulamavofew.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/HgjjieP/knife_block_holder_universal.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/tuvefede.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/8925383.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/8903918.pdfIn PDF document text
    • https://ratojomivufal.weebly.com/uploads/1/3/1/4/131453965/faxoponetiborosarov.pdfIn PDF document text
    • https://fogorito.weebly.com/uploads/1/3/5/3/135322632/3192181.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/vumifumonomememi.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/5974170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivapuremamoge.epizy.com/business_cards_psd_layered_free_s.pdfIn PDF document text
    • http://rakejobik.epizy.com/pixakubufonotas.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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 5472 bytes
SHA-256: 5f1ee52bbca48ac14d90003102d9437356fdb0ce35f67845b2a515cd11b9bffb
font_01_sfnt_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 9824 bytes
SHA-256: 5ad1375e763a45eaef9d5edfde7cf44e10f174e339bb984cd799e4f9fe34c43e

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