Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f13dcb899f126c7…

MALICIOUS

PDF

84.5 KB Created: 2021-02-13 01:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f2d36cbd5c31044ea35b0c3e859a4801 SHA-1: 7a105c62718b2ee4020db8ac01303a8de3ae8b20 SHA-256: 8f13dcb899f126c7003373adebdc398b2358f2fd52fde8df5f282ee14b047baa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs, many pointing to disposable domains and link farms, suggest an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://leonvi.ru/wix?keyword=right+time+of+the+night+linda+ronstadt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417656/normal_5fedc66126690.pdfIn PDF document text
    • http://card2card-perevod24.site/blue_rose_flower_images_free_hd1u5l3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_601ce01cb5e3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5fce51f5021c1.pdfIn PDF document text
    • http://redirunna.xyz/customs_declaration_form_cn22_239028d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fefaa1741331.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/448753139653myvv.pdfIn PDF document text
    • http://m-ryanaf.site/6030384996axfbm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_5feaeda52c920.pdfIn PDF document text
    • http://vostokzapad.su/scrabble_game_online_free7gagk.pdfIn PDF document text
    • http://tonagruz.ru/tinowataterelixuvufrcvy8.pdfIn PDF document text
    • http://canonsburglake.org/vuridagutazonhfdo.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/watajive/multivariate_data_analysis_hair_2006.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/kalenjin_bible_old_testament.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/ann_gift_guide_persona_5.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_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 5328 bytes
SHA-256: 94745451b5dceb900cad42f80c26e7db687edf816836f15187140e99b51c9a0d
font_01_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 10628 bytes
SHA-256: 2902d2d6474f961b4f61a3257d301da671b652c5f1a1e3cc06ba659635e5d193

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