Malicious PDF — malware analysis report

Static analysis result for SHA-256 d378b9d2f2fef43f…

MALICIOUS

PDF

77.9 KB Created: 2021-05-17 08:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8647f93917f5246f74c336c49f1869a0 SHA-1: e720a127b1ea4653f39c76e5531dc141920a87cc SHA-256: d378b9d2f2fef43fcf1a26ec115d97b5da78276abc9cc171200ccf919488095f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=does+hp+w2408h+have+built+camera
    • https://cdn.sqhk.co/zijikunu/jchbjdX/17177598417.pdf
    • https://cdn.sqhk.co/sopiloroda/jgghigg/revenge_of_sultans_1._7_5_mod_apk.pdf
    • https://cdn.sqhk.co/duzemata/WsPZ9hi/radio_rock_and_pop_online_gratis.pdf
    • https://cdn.sqhk.co/levowexesu/2gjihf2/oscar_wilde_plays_list.pdf
    • https://cdn.sqhk.co/lojosexotak/hRuyX5e/reconfigured_definition_computer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vubedarav.epizy.com/72479861264.pdf
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_e121af6fece144c78c7d788d9ea76160.pdf?index=true
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_1ddca82ff07d4621b6c18187be6b5d4b.pdf?index=true
    • https://s3.amazonaws.com/befafuni/kozuwakosojufojeg.pdf
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_89c3df6a24f94ba6b368cdc67450cdf1.pdf?index=true
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_09f16f3e7304471e8038b64f94acd4c7.pdf?index=true
    • http://vuwotona.epizy.com/22584953383.pdf
    • https://s3.amazonaws.com/tuzakifezara/mcgraw_hill_reading_wonders_3rd_grade_answer_key.pdf
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_27fdeba4221a47158e6420b6ed01f940.pdf?index=true
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_d7074934546c48a8b59818ae621342c3.pdf?index=true
    • https://s3.amazonaws.com/sinamozagemoger/85132884843.pdf
    • https://s3.amazonaws.com/dewutexorob/47570185238.pdf
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_1fc67e0720bb4918bb60dafed216e7eb.pdf?index=true
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_120485f97f0e41eaa150c89ede781d24.pdf?index=true
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_218192d09d234d7b983e60647cbd61f8.pdf?index=true
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_30011e491cd847de9f61a6e62938ea45.pdf?index=true
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_c05693bfdefe40d0a41dd6440f645b72.pdf?index=true
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_14cc6a97b5234ff5935a0baba190d100.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc2.bin
16a2fa373ea3a8070ed0a226f6d347b254f90f526d3ea6dc7556b1487a210c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 6020 bytes
font_01_sfnt_off0001043d.bin
d5746ca4b9ff3490a98cb7273dc3027760d18b47ef49be75af67082a7c5af4df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 11116 bytes

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