Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7d081ea61a9d33…

MALICIOUS

PDF

75.9 KB Created: 2021-03-24 05:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 13c0be8f2ce906df70abe3b75900fc5b SHA-1: f82307c305acf243c534ca11b561768ba7ce0ce8 SHA-256: 2d7d081ea61a9d331c6ad353f6b8065937d7be1f30a5508df12ec649d7aedf81
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 of which are on disposable hosting, suggesting a link farm or SEO spam campaign. The embedded URLs and the ClamAV detection indicate malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure and numerous external links point towards a malicious document designed to drive traffic to potentially harmful websites.

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://leonvi.ru/strik?utm_term=nuvi+55lm+map+update PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407084/normal_6039b3f7e89a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388841/normal_5ff0e89b62dcb.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/asthma_adalah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_603a63b24ce70.pdfIn PDF document text
    • http://sewawena.scienceontheweb.net/47802281578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_604b905a9151b.pdfIn PDF document text
    • http://easylearning.space/what_reading_level_is_harry_potter_and_the_order_of_the_phoenixrblns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fd38e4287b6f.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/urdu_to_pashto_dictionary_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_6016e1ea33ded.pdfIn PDF document text
    • http://creditreportfast.info/what_temperature_is_outside_right_nowcbg9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_602ebb30541c9.pdfIn PDF document text
    • http://tesilav.sportsontheweb.net/sukari_gold_mine.pdfIn PDF document text
    • http://blubadgehelp.net/39664057153oj9vx.pdfIn PDF document text
    • http://igafnd.org/sabererepoxadizdv327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459176/normal_604f0072019a8.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/fekife/dna_structure_and_replication_guided_notes.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_4d759e3ba47b41cfa745a720807a8583.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/kebilala.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/free_brochure_template_ms_word.pdfIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_3cdd760f790845bcacebbc97301e7c3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/9446875980.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_69354ac1933b44b0b65f3fad92cfb5f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/47061077036.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_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 4984 bytes
SHA-256: 8398e599c8eb6e7eeda0d1e94ad7fccefb421679b435aa2897bfef2dd4a55252
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 11460 bytes
SHA-256: 5b7158dff4a7b44fc43815ef96afa8b75b76d19292420c145637e9b0c3756352