Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2c1495ea644135…

MALICIOUS

PDF

75.8 KB Created: 2021-03-25 05:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d250cdcfdd62a3a1ff021b8eab01d76 SHA-1: 7f76d5b58138486756f762a4cdb09b29c4387ad8 SHA-256: 1f2c1495ea6441351e467da4d183fb70c29d8c491c3ec2bd7b0cb2eb685b5b30
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/123?utm_term=principles+of+genetics+by+gardner+pdf
    • https://cdn.sqhk.co/wisivelu/ciahbgh/android_best_tv_show.pdf
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/debebaxex.pdf
    • https://cdn.sqhk.co/fevivesuxofo/yggig99/drag_racing_rc_boats.pdf
    • https://cdn.sqhk.co/towafeniruje/O9iayia/free_wifi_for_students_cox.pdf
    • https://cdn.sqhk.co/xalibolopov/cqzYO8L/21384047024.pdf
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/9d75ef80032b.pdf
    • https://cdn.sqhk.co/vinogusi/OWugghj/39747530666.pdf
    • https://durezawower.weebly.com/uploads/1/3/4/4/134472500/pigolapot.pdf
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/tanat-komakiru-xixuwotapizis.pdf
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/pebufigir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2288d39d-41dd-4bf5-a0e8-2695252c8c00/what_is_feminism_in_sociology.pdf
    • https://s3.amazonaws.com/vedexajawo/taterivadivizugukukeli.pdf
    • https://uploads.strikinglycdn.com/files/2acaf44b-356d-40ba-a38f-84d714fa897b/what_is_the_meaning_of_the_word_art_deco.pdf
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_4658ff66d4804679a33fcc5e03fb6588.pdf?index=true
    • https://s3.amazonaws.com/lorerexeg/rugajejusax.pdf
    • https://uploads.strikinglycdn.com/files/489de367-e554-4f71-8006-f1be6792dcfa/islamic_prayer_times_san_diego.pdf
    • https://s3.amazonaws.com/defipedibe/caldera_forms_examples.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_b1d2852abee14f4198d7c45fca698b0f.pdf?index=true
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_a5c2f52cf97f4635a7d41145e809c4c8.pdf?index=true
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_2fbda05aea674b9a8efefdf8b2dc2900.pdf?index=true
    • https://s3.amazonaws.com/rafiralexezol/excelsior_mn_shopping_hours.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_1bea9bdd49ca493a9a69f09738658e7a.pdf?index=true
    • https://s3.amazonaws.com/niporofez/in_the_heart_of_the_sea_film_streaming.pdf
    • 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_off0000e8aa.bin
35871ecb5988f9a9143769a15341a3efabe5cb8f732615a8a1a171a2e873d7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 5564 bytes
font_01_sfnt_off0000fba6.bin
f2e2fbb85437d226a01e55ed46208ecd7e749e3fec1a306619655a7eba25d293		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 10700 bytes

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