Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d1eadbca2a5343…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 12:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3850564ed96c89919639133cabe302d5 SHA-1: 368fa04384cc8b55b700ec6c6795ff894fe0d851 SHA-256: 35d1eadbca2a534384f527f267059b6743bfd9e28b8f074eeae555e7a36d66a4
146 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically mentioning "free pdf" and "strategic advertising management", suggesting a lure for phishing or malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent. Although no scripts were extracted, the document structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 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://maypoin.ru/award?keyword=strategic+advertising+management+free+pdf
    • http://lobabinuladeri.medianewsonline.com/62400740212.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/pekasuwe.pdf
    • https://static.s123-cdn-static.com/uploads/4408873/normal_6007105ad6010.pdf
    • https://cdn-cms.f-static.net/uploads/4408709/normal_601f78e952bfe.pdf
    • http://metoxegid.mygamesonline.org/how_many_times_larger_is_betelgeuse_than_the_sun.pdf
    • http://namafafiteg.mypressonline.com/april_2020_current_affairs_insights.pdf
    • http://nashremont.site/vurapetusokowalizinekamaw8t7v.pdf
    • http://dawezedelofeda.scienceontheweb.net/tefulejekenulonelaroboma.pdf
    • https://cdn-cms.f-static.net/uploads/4417222/normal_60187134bb35b.pdf
    • http://slimitalia.space/is_ipod_touch_5th_generation_still_supportedr144p.pdf
    • http://dewisazovuvoxi.mywebcommunity.org/aa_step_4_worksheet_examples.pdf
    • https://static.s123-cdn-static.com/uploads/4446944/normal_5fee12b20c059.pdf
    • http://mobufuwiwid.medianewsonline.com/riwidazabunakobikiwuvab.pdf
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fcd3429176d5.pdf
    • https://cdn-cms.f-static.net/uploads/4459774/normal_6012c60b39e9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_027eb5b544844978b4b2a77d54bca4a2.pdf?index=true
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_caeeb73bce4542cf94694367cb0c007f.pdf?index=true
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_c52d88b824eb41ac8cd7d2c5a35d7913.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_d80b92abb06e49efb055fec17266747b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2f.bin
79a51d8dfcdb2f05bfd4f9a2bfcf3f223e5927cdacae3260f1e08c72e926ee37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 5608 bytes
font_01_sfnt_off00010e3e.bin
b3c4cdd664c0912651fe3292ed13242135108ebb052b814c5df46b21de30d093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 10424 bytes

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