Malicious PDF — malware analysis report

Static analysis result for SHA-256 652e37c374282f64…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 11:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 36110d297b0696a2ea8ecf2006b63acb SHA-1: 6f3ca0a0f74410ada2e8d0c3a87f13c520b6395c SHA-256: 652e37c374282f64e7e5c4158d048afba5fc67cc84e0a5108169dd97fb96eb79
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=clio+vf21+tone+corrector+cc+%2523+02 PDF link annotation
    • http://pokemonrivals.online/judajuwazoxefufuraravivoz1as7d.pdfIn PDF document text
    • http://takipleskazan.org/famepuvivugipexasazipo3qzl.pdfIn PDF document text
    • https://cdn.sqhk.co/piredonina/0hccOjg/adventure_balloons_login.pdfIn PDF document text
    • http://lifegirls.site/6846517935q1oa2.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/igdjcha/64571743479.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/aiecIQN/pbs_video_streaming_contact.pdfIn PDF document text
    • http://tixshopclub.fun/what_does_the_latin_word_ad_meanoh8xv.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/tppgicM/repair_my_car_mod_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wufaluvete/1hjcsjd/face_masks_reusable_amazon_prime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_0cf1cd532599476690ffc80d496aac96.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_b991a012281b46f8bde098f52e77c38e.pdf?index=trueIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_e163b15c4ea343ec99dee15d9c3fd043.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c807ea-a05d-4f0c-9fee-b6ae4bc40cf8/48579309636.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_8e88029c861d41f8a20e0519ec568811.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54093da7-c69b-4f09-bbcc-30b1cacecce1/zolimofo.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/formal_application_format_for_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b98269-4e80-4892-8615-97d8a5bbed6b/patababuduwokudelelu.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/28062176083.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/what_is_meaning_caliphate.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_a0ebebbcbcb94c32b456e79e99fd8f2f.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_dbdd01cdb27948c4905643aaa76fce90.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_f8630ba63adf4228b597eed266d150e6.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_d4138924999a46c293d9f95159908fc2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 4636 bytes
SHA-256: 25ae60b465ccb49478049f71e424a686a32e52e412e7c43be075c045649e255e
font_01_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 15476 bytes
SHA-256: 71ecedc5fbb3c5ec07f14062886798a93e0d935265740f9e61170b45a10d4a25
font_02_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174