Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b5d2d8842b8ef5…

MALICIOUS

PDF

80.2 KB Created: 2021-03-12 04:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b7d087d77496a92f65a277348ab0464b SHA-1: 8e5537db3984bdcdadfa68b68d76b6d30b8ec69b SHA-256: 84b5d2d8842b8ef5846a5d42e802aa0430c3c93a661b040b4161ad6ac5cf4091
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external URLs, with the primary one being `https://jumiwimov.ru/123?utm_term=herpes+labialis+guideline+cdc`. The presence of a link farm suggests an attempt to direct users to potentially malicious websites, likely for phishing or malware distribution.

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 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.
  • 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://jumiwimov.ru/123?utm_term=herpes+labialis+guideline+cdc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373271/normal_601d2fbf52eab.pdfIn PDF document text
    • https://cdn.sqhk.co/jokalirubore/dfCSe65/vulabaxigavikonug.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/6876311.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/dOijgid/61225922961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_5fe6c52ce03cf.pdfIn PDF document text
    • https://cdn.sqhk.co/falupuvevore/fjhigjb/2373665487.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/bQ85imV/puppy._io_race_amaze_dog_run_3d_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/iejgjcb/zoxogubetilonutaw.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/maral.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/gehhWjb/dungeon_archer_run_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/Jghjhgi/get_remote_control_multicolor_led_strip_lights.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/kjcXyje/80480900477.pdfIn PDF document text
    • https://cdn.sqhk.co/wiberini/jegcjiW/xonidetagunekavomebalinos.pdfIn PDF document text
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/gejetadarex.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dW4mzhc/bozivikavodepebigewojisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/musasibanuj.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/lic_jeevan_shanti_policy_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/free_printable_independent_life_skills_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/xiruzabivejojuto.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/ap_stylebook_2016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 5036 bytes
SHA-256: 88f52350c04091240ba6a08c763db94cfd98925d0b1128cc02e5611e0f6b3a19
font_01_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 10232 bytes
SHA-256: 87725dae8a5089d374d6f63f6da0a5d779ab35b5dea9a103bb7ee1611c42a52e
font_02_sfnt_off00012585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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