Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e9a0341778dd58…

MALICIOUS

PDF

86.3 KB Created: 2021-05-15 16:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03753fea6b3a03bb63420c1384809838 SHA-1: 1a267469084ecfcccc679f0b9d350b2116b1cae0 SHA-256: 79e9a0341778dd58a8c4744797707bd849322989b94ad56391197ca4cfb5fbd0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious intent, possibly involving embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cdn.sqhk.co/vagekoxes/acjihaF/44577089781.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_5fe73e0cd704f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_600aad2c657e2.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/Z6Pijhe/fr_legends_s15_mod_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fe4118bde746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_604194e098d2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_5fd7ee7cb5863.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/mjgiggf/mimavakuxorelejetuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_606d198015860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_604ee56422774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_6031512e94339.pdfIn PDF document text
    • https://cdn.sqhk.co/jawosuzexe/pjgwBja/best_deals_on_apple_watch_series_4_cellular.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_5fdcc9f03b308.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/egcbCie/99303232338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_6010cebabf95c.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=pencil%20drawing%20shading%20tutorial%20pdfPDF link annotation
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_8bec1b6082ee4789a35a54bdfed33ac6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9764d475-d961-478d-8597-f8d880c3358c/dapunotubejaraniwanig.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_6ef21ff8e3734d14b42e50f2febccf46.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b05435-963b-41fa-bc6e-8684a7fa5533/how_to_flash_american_megatrends_bios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db45d5e1-ff51-4d24-a689-d3224d228177/why_rh_law_is_important.pdfIn PDF document text
    • https://4da44922-6ee1-4515-aed7-54c3d6b51f77.filesusr.com/ugd/243a28_83a5840c1cde499a9ff7108baafa8be3.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_37d83234632b4daea06b081d3580a043.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_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 5392 bytes
SHA-256: 5b590ba9791ab88b1f7eac3407723d82df42eb0075e6da905b27e5c5ebc9d622
font_01_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 10296 bytes
SHA-256: c7f1a2b45e84a88dd6bb243d297d7aafd86117043c0c54bceb9d56847df294b7
font_02_sfnt_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34