Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82352526d7be9f7…

MALICIOUS

PDF

81.2 KB Created: 2021-03-02 21:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8d4ec3b56a49977947b329c1cace97a0 SHA-1: 443b639ca1f56908b11964f126834c5c719ead26 SHA-256: b82352526d7be9f74ca60a52cb2a6bd6730371a57b4fd7881a25a7252d2748ed
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting and another flagging a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the redirection to known malicious infrastructure suggest an intent to lead the user to harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=worksheet+enthalpy+and+hess%2527s+law In PDF document text
    • https://cdn.sqhk.co/vabalogu/jighic5/uk_slot_car_shop.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/8886687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_600ae7da5946e.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/e22d9d0c.pdfIn PDF document text
    • http://thecabinets.xyz/band_set_music_mp3_free_downloadoysba.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/30065dda91.pdfIn PDF document text
    • http://betmoy56.com/gesuzufebch5pe.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/2262435.pdfIn PDF document text
    • https://cdn.sqhk.co/pometobab/g1AHjin/private_tunnel_vpn_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/hiETiie/xavofa.pdfIn PDF document text
    • https://midatapeb.weebly.com/uploads/1/3/1/0/131070166/b4fc9b7f48c914e.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/jiz9tAX/kuvonigosirepefegumif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lalafen.epizy.com/87998466507.pdfIn PDF document text
    • http://fajodedepadabu.rf.gd/roxedudoregotigun.pdfIn PDF document text
    • http://redusaboj.epizy.com/waseduxover.pdfIn PDF document text
    • http://lutumogeli.rf.gd/64054620721.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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 5352 bytes
SHA-256: a27e7501b10eda3213bae38d06e1f278082624202c5700f469833038cd055d79
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 15296 bytes
SHA-256: 2c47448cb3e4cac98faeb11077001587260ebe31fd123a7ee2406e59f8c91f6c

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