Malicious PDF — malware analysis report

Static analysis result for SHA-256 9590f6c8a5f4144c…

MALICIOUS

PDF

83.6 KB Created: 2021-04-10 14:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50fcdf5b21ec705ae4e5d7f255d9e163 SHA-1: 7e5f36c9df118efc93ef7da9333192b57b23dbf2 SHA-256: 9590f6c8a5f4144cd23b09f9c7b776c703f9fa1bbb4dbcb18125237030861b71
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://dafemum.ru/strik, which is likely used to redirect the user to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=are+all+kidde+smoke+detectors+compatible
    • http://5coupons.info/business_reference_letterrgrag.pdf
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/4296985.pdf
    • http://natfreshik.fun/complaining_and_apologizing_exercises5jzh8.pdf
    • http://toolsbestpricemicrometer.site/61699407725z212k.pdf
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/5a15344669f2c.pdf
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/2597882.pdf
    • http://arm-watch3.club/875252497117m6jb.pdf
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/zunoreraki_ximirus_mobepis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_5386f71477a745f7b65eca3e95358582.pdf?index=true
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_2e539e25295846eeb918ba8294f3e08f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48256c3a-4c83-4735-9175-d794d048d7ae/can_i_use_a_universal_remote_for_roku_stick.pdf
    • https://uploads.strikinglycdn.com/files/8418fa3d-f7ef-474f-abfc-b2ff0638ecb0/longinus_on_the_sublime_summary.pdf
    • https://uploads.strikinglycdn.com/files/c8d02dcf-1a96-4305-b6ba-6130f0f3b9c0/37182527072.pdf
    • https://uploads.strikinglycdn.com/files/f0e6c69f-006c-4590-84d2-ad0a6a331b6f/zizupadolupexojebinezos.pdf
    • https://uploads.strikinglycdn.com/files/17ce6bb9-5f43-4ab1-87c8-85ebb1b17822/68571750108.pdf
    • https://uploads.strikinglycdn.com/files/02fdcbf6-e825-4701-bce4-338bce41356a/what_is_the_meaning_apparatus_in_tamil_blame.pdf
    • https://uploads.strikinglycdn.com/files/93e6634c-8787-4c45-ac9e-edd52c3479b6/fagumimoxuserewosewe.pdf
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_edf73dde329742a79c2cb7fdc94c7e1a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4b516ebc-874c-41d2-aaf6-e095e2ec38f6/desuzeroletogumusos.pdf
    • https://uploads.strikinglycdn.com/files/aa2c993c-dc1c-4f8f-87a7-d5c59427b3a6/64346148930.pdf
    • https://uploads.strikinglycdn.com/files/feaba8cc-aa7b-4607-96dc-4aba38f6f459/bezavugagapalanisabo.pdf
    • https://uploads.strikinglycdn.com/files/37c46aa6-cb06-4a47-9b20-692a3fcdf407/20976339683.pdf
    • https://uploads.strikinglycdn.com/files/132073e4-cb7f-43cd-ac18-be208c0fc543/the_power_of_focus_jack_canfield_audiobook.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f202.bin
6f9e1e0652cf97bbddbeba7c87ef14160dc716d8e3d724fdd48cb08c9cec6067		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 5412 bytes
font_01_sfnt_off00010448.bin
63facf801d3ff616cafce825c398f45bd4e62ddf31e9f130f2a6900cd116eca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 10964 bytes
font_02_sfnt_off00012a00.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 16060 bytes

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