Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b18f1ff194351dc…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 13:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: da9599f691b5ca39add2626b9b2f6e10 SHA-1: 1bc690524b78975ce02318908a6c56b23f0d7f38 SHA-256: 5b18f1ff194351dce90c70031c86125c7363dbd888abe982a4edb585b0cf2dd7
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a potentially malicious domain. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to redirect users to other sites, possibly for SEO manipulation or to serve further malicious content. No scripts were extracted, but the PDF structure itself is the primary vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://maypoin.ru/wix?keyword=cool+math+games+ninja+painter PDF link annotation
    • https://cdn.sqhk.co/xeloxilava/eBienja/wavogofug.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigozujeme/4XWbggE/secureye_biometric_attendance_machine_software.pdfIn PDF document text
    • https://cdn.sqhk.co/gisanewat/vOhfwQH/hack_shadow_fight_2_mod_titan_lnp.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/Kiggfn5/rajanijimakepozufo.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/ZkjhjaI/road_cross_risky_free_games_online.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/24897104418.pdfIn PDF document text
    • https://cdn.sqhk.co/rogolafu/phgcrjg/turn_on_alignment_guides_in_word_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/jasuxerazifo/Sehh3hj/27582120511.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/kanifometogovunife.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/kupekofopuralosugul.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/95653148902.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_a1702f9132ce492ca90f955773a22d41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d9038d-0399-4ab3-bbd3-a38141aa8766/zuxeluludositajoratufo.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_aba696dfa4d8471db4187c07663c5046.pdf?index=trueIn PDF document text
    • http://boxijekew.atwebpages.com/14490414075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7120f1c2-94d4-49fc-8e63-64c4ceb3188a/what_is_leave_purchase_allowance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43db6da-c323-40d8-9b20-f0cd103a31f7/1994_chevy_nv4500_rebuild_kit.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_e0bbd176ca514f0483ef492762ea86c0.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_736674d20e7a40f4ad75a51e9207fb5b.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_0bd3df3d2ed0406b8e6f02d1e5d45e78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98257d1e-748b-4347-859b-b38cac348abc/how_big_is_a_4_quart_slow_cooker.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_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 5216 bytes
SHA-256: 7cd1a44a43e6e9703549f6c1371ad12ed33b6cf0801d3ca509ccf9cc1d2396a9
font_01_sfnt_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 12720 bytes
SHA-256: 92115f784280ba66fc23c508f19b0dc4e861aacb2251591c594c6ec0ee850e51

Open this report in the interactive analyzer, or submit your own file for analysis.