Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8926fccac198619…

MALICIOUS

PDF

80.3 KB Created: 2021-02-23 10:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9ba59ac4986640b3849d04b443bc789e SHA-1: e04b11d5429380697ad2a2f1ef48c0ee05803247 SHA-256: d8926fccac198619c0f2477a0af3d636e825addde5a1bb05b004139eb3eee388
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms and redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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.
  • 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/aws?utm_term=el+pollo+loco+5+dollar+combos+menu In PDF document text
    • https://cdn.sqhk.co/pupevadojas/iaAXjic/alarm_clock_sound_in_words.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/5vicoje/34686174006.pdfIn PDF document text
    • https://pufotesur.weebly.com/uploads/1/3/1/3/131378771/pefuziwesat.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/filedenaredorajomoze.pdfIn PDF document text
    • https://lijemokuw.weebly.com/uploads/1/3/4/8/134853622/ripuseworomu_sudas.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/8996373.pdfIn PDF document text
    • http://tirudibemaj.22web.org/inglourious_basterds_720p.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/Mgc0MMJ/new_hip_hop_music_2020_youtube.pdfIn PDF document text
    • https://vulelarebu.weebly.com/uploads/1/3/4/9/134900748/vofewifavola.pdfIn PDF document text
    • https://disesusobabetom.weebly.com/uploads/1/3/0/8/130814900/dbfd554054d904.pdfIn PDF document text
    • http://rezltml.xyz/children_s_double_bed_linen480vv.pdfIn PDF document text
    • https://gosalojuwik.weebly.com/uploads/1/3/6/0/136050429/884e15.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
    • http://jabelakejirer.epizy.com/tajezijepepavawivem.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/76674071807.pdfIn PDF document text
    • http://pulijivugis.epizy.com/contact_us_wordpress_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/tizutarunovewiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/celebrations_around_the_world_worksheets.pdfIn PDF document text
    • http://jojerigexorow.epizy.com/62690683494.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 5192 bytes
SHA-256: 0d57fff1fcc51d02a2e4be03f9a89e4a89cd03756860f95dc558682159d11a0f
font_01_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 3628 bytes
SHA-256: 0568c4ae6d3c356ac6e61504dbdccc3f81905d693731a0b5db7f1d39d62e6643
font_03_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 11380 bytes
SHA-256: f185c698ab4bf463045b1d1cb95e8f792af23f7991cc7f5a2000b0d809ffd419
font_04_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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