Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e2cb838240d971…

MALICIOUS

PDF

77.6 KB Created: 2021-02-07 20:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 387dbabc60a675007585c8851b7ef166 SHA-1: 9428efb3a95b1ed61d2e7fe8a5ac8735e76aafc4 SHA-256: 16e2cb838240d971ce2c3fe72d348ab43494fc20207de7674b57405b2b01b5a6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards the use of embedded JavaScript for redirection or exploitation.

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://seumenha.ru/aws?utm_term=angry+birds+transformers+apk+mod+gems PDF link annotation
    • http://dwatches.site/zuzuzurewitevozofiw21vs.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/fgegebt/geometry_dash_subzero_apk_hack_modo_editor.pdfIn PDF document text
    • http://mestorating.ru/epic_games_support_number3o71m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5fce5f52d37f9.pdfIn PDF document text
    • https://vepufekuso.weebly.com/uploads/1/3/0/7/130775624/zofokogetekenon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481400/normal_6008691b6aff6.pdfIn PDF document text
    • https://tunizobun.weebly.com/uploads/1/3/1/0/131069832/2971641.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/pZjdGhe/garden_border_fence_with_solar_lights.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/janagesilevozuvirotu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5fe60298cb0d5.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/hcgfhjo/earn_to_die_2012_part_2_weebly.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/efscHii/60813904244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402940/normal_5fe07e81d1f98.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/dmV9hes/23958783716.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/7806019.pdfIn PDF document text
    • https://lesezisuwo.weebly.com/uploads/1/3/4/1/134109364/suzuxerakupovajeb.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
    • https://s3.amazonaws.com/xomepixo/voltage_step_down_transformer_diagram.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 5412 bytes
SHA-256: 80cd3472c50a8f93891a5971a55c05a6ddfedf84e758e31371f2195d7aa67eed
font_01_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 11120 bytes
SHA-256: c702c420caa638e4dea55e9bed0af7a9c530c76fcb7bc7849f322cbf68d74c5b
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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