Malicious PDF — malware analysis report

Static analysis result for SHA-256 e612da6a933a0eb7…

MALICIOUS

PDF

79.8 KB Created: 2021-05-27 08:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 715c11eb0bb2bdca454e71648d40a1b4 SHA-1: 71cf2287929cfcb3bf5a15ab82bb539af7a67c99 SHA-256: e612da6a933a0eb704a3974928d9777da5b4be3d0f24998019b0281a9582864e
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=exercice+physique+football+sans+ballon+pdf PDF link annotation
    • https://piminuwimizo.weebly.com/uploads/1/3/4/6/134674326/fupixojo-zefofugape.pdfIn PDF document text
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/lijegul-gemofajixoku-sabalorowapo-dirabitovozuve.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/jexovimawevi.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/a269afa33de6c99.pdfIn PDF document text
    • https://gejekawuxo.weebly.com/uploads/1/3/4/4/134497426/2698608.pdfIn PDF document text
    • https://jazuwexakabe.weebly.com/uploads/1/3/2/3/132302764/ladojipuwewuse.pdfIn PDF document text
    • https://gumomukus.weebly.com/uploads/1/3/4/4/134435284/folivez_tizuki_tidul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466151/normal_5fdad494a21e2.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/fusimuwilera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_5fffa9ae49cc5.pdfIn PDF document text
    • https://wedarudojov.weebly.com/uploads/1/3/4/0/134012757/7455488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452850/normal_5fcce83f9f364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fcc2c493bd0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454164/normal_606725f4f1d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_601a799bea80a.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/a84962cc7.pdfIn PDF document text
    • https://todonuratalojin.weebly.com/uploads/1/3/4/6/134605818/2783560.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/262715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373770/normal_5fed52efa16b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17018a2-5287-40ff-a6aa-a553a1dba036/liwitapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7e9336-efd6-4d05-8564-35f7808e6b33/how_to_clean_hot_springs_spa_filters.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_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 5636 bytes
SHA-256: 2c5b4930f0fd3f7f0cd8cb23e24bb64f3d592730466045f2d319515f1b5365a7
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 12144 bytes
SHA-256: 50151f878a29ba4b4fe57b5199c2b51fd5a36cfd66604bc6883d17fb70676342