Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9a2301f5d3fb3c…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 19:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d2947f0243b54908d25f95322cbd1be8 SHA-1: 669b34c7791a25eb2bdb14d36d16a99183e83bc2 SHA-256: 5f9a2301f5d3fb3cf81ebcf212bf0aaf957032e701cfed86126a26f83ec4797e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains a large number of external links, many of which point to disposable domains or are used in a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://ponafet.ru/strik?utm_term=broken+spears+miguel+leon+portilla+pdf PDF link annotation
    • http://irisca.online/851856692580o3tv.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/64207122987.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/gajutegodidi.pdfIn PDF document text
    • http://reduslim-shopofficial.site/what_is_artificial_neural_networks_annvkf1n.pdfIn PDF document text
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/3303f17.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/do_all_flies_have_antennaes1lkp.pdfIn PDF document text
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/nafoxufiwupot_gepadada.pdfIn PDF document text
    • https://najoxoveg.weebly.com/uploads/1/3/4/6/134677255/bb8edac0ad2e5ea.pdfIn PDF document text
    • http://ygrash.website/38038162832nz12q.pdfIn PDF document text
    • https://tasozowi.weebly.com/uploads/1/3/4/3/134315408/xitaduvop-nenadeki-nojow.pdfIn PDF document text
    • http://saudiautoinsurance.com/cowboy_mouth_sam_shepard8mrn7.pdfIn PDF document text
    • http://pshcomonhere.xyz/nefuxuwekekaxamuhfeum.pdfIn PDF document text
    • http://prostochillforum.fun/download_pc_creator_pc_building_simulator_mod_apkkc9ti.pdfIn PDF document text
    • http://jobauthor.online/define_bombastic_antonymsx6b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf2b7b75-7790-49a7-81e6-d2546e692b42.filesusr.com/ugd/8ccf63_0ef6bbadd2db4583be43923f21708d06.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_54ac5486e4024044bd9ee6f3bb5e9f6f.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_3b04ee18fae04fc1bd5f7567c5e95f50.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_45f80ab8b3544c658f1683dfe9e0629e.pdf?index=trueIn PDF document text
    • http://wemitagokodunes.epizy.com/39252582121.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_68b8fd1b2c2e467e85a23657bf7c54d9.pdf?index=trueIn PDF document text
    • http://fijusix.epizy.com/islamic_banking_system_in_pakistan.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_ee285b55abf74a1289c7b34eb6cdc1e4.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_0fe3e12c0dac46e59c9991785fd9076d.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_8743c727f03e46999df1ecd7212340ba.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_7233adb7504c4da288fe9996da9301a6.pdf?index=trueIn 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_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 5476 bytes
SHA-256: 113008ea0b929544215507ca44a918c68491e9fde11d8a54a9c4596279089d9a
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 13328 bytes
SHA-256: 1c5ecb6304daaa0e76fa3dd1e835fbc15fab56a6ecbf3a26ee927794ccc02bf7

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