Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb62fab5f76cbdc…

MALICIOUS

PDF

74.9 KB Created: 2021-04-11 18:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 90affcffbefd93acddf5f4ca1e84c8cc SHA-1: 660112cf77b29b70f563462f4c53ee361a1c8e38 SHA-256: 1fb62fab5f76cbdc499f898c87940271aaefda9ee536328f8e909adf2f3d985c
146 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the final malicious destination. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, and the ML classifier strongly indicates maliciousness. The primary malicious URL identified is https://dugedepap.ru/strik?utm_term=what+is+the+menu+for+el+pollo+loco, which is presented in a deceptive manner.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dugedepap.ru/strik?utm_term=what+is+the+menu+for+el+pollo+loco PDF link annotation
    • http://silekutum.medianewsonline.com/palavras_cruzadas_diretas_coquetel.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/rugapara.pdfIn PDF document text
    • http://derixen.22web.org/volexirobarepeturekifuse.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/3d3e48.pdfIn PDF document text
    • http://raisinshq.club/ge_adora_dishwasher_error_codesgpzca.pdfIn PDF document text
    • http://vagesibakizame.iblogger.org/33994116824.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/63116804514.pdfIn PDF document text
    • http://leon-stavki.info/gulozojowithh637.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/85734.pdfIn PDF document text
    • http://bristol-yalta.run/zexanikukaroroledakomabumbwcod.pdfIn PDF document text
    • http://xebupado.mypressonline.com/nokiliruxaru.pdfIn PDF document text
    • http://sluzhba1.net/biophysical_techniques_campbellgl609.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/c4afca3f-8a77-4aac-99b5-6abcb1cca113/facebook.com_help_delete_my_account.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/z_black_remix_dj_narender_mahala.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/jujazikerikera.pdfIn PDF document text
    • http://pikasimowojinub.epizy.com/living_buddha_living_christ_20th_anniversary_edition.pdfIn PDF document text
    • http://tebimanapedupun.epizy.com/bowflex_treadclimber_tc200_safety_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/584992a5-e6fd-49a0-9683-a731b7ea0f02/how_to_request_an_autopsy_report_in_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c69ad344-9916-4bb9-8388-a93d2f6469c0/samsung_srd-842_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/ati_radeon_hd_5400_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7941f2a0-acfd-4ee9-b287-c2991f639b52/96180772197.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 5268 bytes
SHA-256: 80f92807a81990d850acb7c61759241d44d82b712d56c4a74641c220be614ee4
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 11328 bytes
SHA-256: 7135566f7215e37b3535775c8fca333d1a49aebd93bdfa1b16ed9ec97da20982