Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebb77a5d73bc2d9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 11:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b200af758f47cca697020013203fcdee SHA-1: 91c9d9b18577ebd00b2b7bce18222aa7c2e037d4 SHA-256: 0ebb77a5d73bc2d99316985c597f62cae33161e651c63b09f7e200db001118ce
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=what+does+missing+activity+mean+on+google+maps+timeline PDF link annotation
    • https://cdn.sqhk.co/wepunajexiju/6JjbjcL/old_fashioned_girl_names_with_meaning.pdfIn PDF document text
    • http://tehnopolis.org/cash_voucher_format_in_malayalam81rpd.pdfIn PDF document text
    • http://toppiksnack.xyz/how_to_become_a_paralegal_for_freej5s13.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/hJ3QMhd/android_xml_autocomplete_not_working.pdfIn PDF document text
    • http://topplafond.xyz/arifureta_light_novel_epub_free_downloadmo04k.pdfIn PDF document text
    • http://dalnoboyi.xyz/why_does_my_washer_agitate_but_not_spin71joi.pdfIn PDF document text
    • http://bottlechainworld.com/wolf_of_wall_street_cast_bradgg53i.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/hgVWfib/guideone_specialty_mutual_insurance_company.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/Cefhbgf/domaxadogogaxemapekelo.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/ThjheT2/radio_italia_fm_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_5e8c04fe05f143dab5c30f330825b085.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_b144040f2ec94bc5b076a1346877d718.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_f0a9a576dd894f8e946166cc54ddf8e0.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_fc359ead033d4bbf866592f93db4cae1.pdf?index=trueIn PDF document text
    • https://c7559a44-bdbb-42fe-ba37-524baff16b25.filesusr.com/ugd/0bcf16_70b366862a294f898f61a7c89675fec2.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_0224f986157f4e23bbb610a585002dbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cae4122-cefe-4975-b09a-e29d2dee24d2/nodag.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_e16d7364c1794ecb8c2d8c18b05c2fbc.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_5762162f84464e1e88c215c82197d450.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42fd832-22b8-4068-a313-5d236951ea27/how_to_use_bayer_contour_next_ez_meter.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_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 5564 bytes
SHA-256: 0315dcf3920276f094919a608436c809f52b93058f944a92ce5355287e84fc53
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10452 bytes
SHA-256: 0eb9e6774f20830ebc791e53358c9ce59db9b60dfea4cda0a880506f932afb67