Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea67d915dc44039a…

MALICIOUS

PDF

83.6 KB Created: 2021-06-09 15:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 60eeba863cef276dfd144ec3a1a870a3 SHA-1: 6751b57c19fba20d94847a5ac428752c0c83c7f3 SHA-256: ea67d915dc44039a427289ebed43788b1af21364f968962fa6f5e1d5b0e0a996
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, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://allytemp.ru/pbw?utm_term=geometry+proofs+worksheet+with+answers+pdf PDF link annotation
    • https://pemugaladesav.weebly.com/uploads/1/3/5/3/135307247/f52ecf9d86f71.pdfIn PDF document text
    • https://jolevodib.weebly.com/uploads/1/3/1/6/131636654/sevugubikabam.pdfIn PDF document text
    • https://tegubefebax.weebly.com/uploads/1/3/4/4/134431627/sirame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_606c590d24ec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5fdda5136c354.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9af4a3c-dd5f-4380-adff-93842dc39a0e/matumudurefileseni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea7f73a-9cc2-4be5-aea7-22d344bc94cc/sennheiser_rs_120_ii_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fd4ae6-539f-4c8b-9b13-7334ff71d84a/jonas_brothers_song_lyrics_dance_in_the_living_room.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144521811/84741467919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d33eb04-3d0b-4c8c-881d-1aa592b812e1/diccionario_traductor_de_espaol_a_ingles_google.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4603246f-23a9-486d-958d-8f8f46c23900/mibenutuker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a104ba00-7ce7-404a-a7ef-922b402e9787/biometrics_latex_template.pdfIn PDF document text
    • http://xupatamim.pbworks.com/f/sanskrit_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8275f662-5fbd-4ee8-9762-189839ef7a7e/m_audio_fasttrack_pro_drivers_for_windows_10.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/w/file/fetch/144501015/sopivavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb61c360-ce0c-41b1-92bc-3facafe016cc/meaning_of_social_skills_in_simple_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d139040-31e5-4c09-9940-b42551312e39/other_form_of_passive_voice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c3fc7f-d997-41e7-930f-8249493836e0/jabesajabeperigopab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c3f132-809f-45d8-aa17-adc23896b129/binixiletam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b720b89-b8ad-485c-8321-61c1cd4a619d/how_to_send_money_from_chase_to_cash_app.pdfIn PDF document text
    • http://bekojifutok.pbworks.com/f/16419069934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6d1cbe-03f0-4320-aa2f-6a5d0dfc1617/dezusevuvimepomuwoboli.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 5536 bytes
SHA-256: 238835f3ba7f2fe0cf3e7bee3457db59175b46ca79e9fde1157458f20594478d
font_01_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 12560 bytes
SHA-256: afa521e77ee4cf0dbb5c665b5b2cda24fd36e4aa73a4e93e290f30dee762a00a
font_02_sfnt_off00012af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF5 16248 bytes
SHA-256: 5f427b22373cebbd55e167005b174361c1f4c2df1a22c2fbfbbb0b3c7875427c