Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f0ca497af8183e…

MALICIOUS

PDF

95.6 KB Created: 2021-05-12 15:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fc6e78d96a2f8730957ffb05c24d00e2 SHA-1: a3ecfaed84796ff9376578cc4516978cbaaf3033 SHA-256: c1f0ca497af8183e707b4f581d25b0145b9a7b2e59e6e8d3258ae2b1230d96b5
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, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=how+to+clean+bissell+powerforce+compact+filter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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://jottigo.ru/strik?utm_term=how+to+clean+bissell+powerforce+compact+filter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468536/normal_5fe07b683b218.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/IghsZaN/5786300707.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/cogdv05/36188601058.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/3vjfii7/merge_cats_crypto_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/qTfibhf/29601910548.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/hheviit/mavowelekexivijuwet.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/ijHj4jj/battery_charger_schumacher_se_4022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_60206e6169939.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/wpjhhiw/bumface_book.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/e6gtbpo/likee_video_editor_app.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/ifBFjaL/drive_one_login.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/CMhemji/78817716284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/11a38dc2-2d1c-41ad-b767-33f837a988df/self_reliance_used_in_a_sentence.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_2b83fb2727a44b418b95eae462ff1294.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_a3a00e4ac3834e16ad9cc34d30d8ee1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfdf63f4-c210-4510-8ebf-845eedccc7d5/95015101532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/930bce0b-b9aa-48b8-b022-7549e3493af4/42787835069.pdfIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_c592091b3ea048bbb4a338fe1ee315fa.pdf?index=trueIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_7ef26c6e66604f48b5349434cb4b5c2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fb7935-0c18-48b7-8d3e-3ae983e6f32c/votanavirafusesiwefel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63af10ef-e4f0-46f2-8c28-56075dbcb260/cuisinart_12_cup_coffee_maker_clean_button.pdfIn PDF document text
    • https://a9b7993f-6967-48c1-a2c3-d5bc86fe985f.filesusr.com/ugd/ea2be3_79cab49d907f48a481cb1d6e8f9f62f1.pdf?index=trueIn PDF document text
    • https://37dcb74a-b492-4e6c-94d7-6984b04a3d7f.filesusr.com/ugd/01eaca_ab8fefb2714c47d2b435a775839cfe54.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_3b892d67cb4343a89b51c7a7f99c673f.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_49b992a3da4a43d090d05845dc41cb11.pdf?index=trueIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_60013d9669d24dfa98a29349050cfd08.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_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 5144 bytes
SHA-256: 745c61aeaca7b2bd4b62387acb5cb8032e40e32402797252d0e8c146878c0eee
font_01_sfnt_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 12928 bytes
SHA-256: 70875523636d9605e2fcf19223fd40047f7463df7b17166d7a70374eb05feffa
font_02_sfnt_off00016261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16261 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361