Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1a44238f3b3c66…

MALICIOUS

PDF

98.6 KB Created: 2021-03-23 18:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5b1e57fe1c351f4a4cffe21cd4d6a960 SHA-1: 4eb310b5072ae174ee395f51514d674fdf62c9db SHA-256: 9f1a44238f3b3c66c0597a4dd211fca625a3bc5d3d3d903f5cf43f8ff83a8fbf
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://dafemum.ru/wix?keyword=marie+persona+4+arena+ultimax In PDF document text
    • http://begemotiks.fun/824732650252dc6g.pdfIn PDF document text
    • http://mejumeroxara.mywebcommunity.org/capacity_management.pdfIn PDF document text
    • http://metaleagle.ru/66105082181tslrs.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/mathematics_for_economics_simon_blume.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/mexosekojipis-fefuf-lasari-mivolip.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/92853295907.pdfIn PDF document text
    • http://keepmaxi.space/which_word_does_not_belong_to_the_group_brainlyd6ml3.pdfIn PDF document text
    • https://jebelobuf.weebly.com/uploads/1/3/1/4/131452997/rabonumas.pdfIn PDF document text
    • http://uabiomanix.xyz/best_apps_for_phonemic_awareness0nc07.pdfIn PDF document text
    • http://mufajaku.medianewsonline.com/the_college_panda_sat_math_reddit.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/march_2020_calendar_telugu.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/voxodogo.pdfIn PDF document text
    • http://doorstepcomputers.com/wopaxoforyfdqu.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
    • https://uploads.strikinglycdn.com/files/0b136d37-0ffb-436e-94f8-50ed188a9762/how_do_i_calculate_my_military_medical_retirement_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6080fe-90a7-4714-8b4c-a56e4429a4e2/trouble_obsessionnel_compulsif_medicament.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/fafipagagaborewupesosuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f291eb0f-76fd-409e-8aee-078e5504d8c3/41806886650.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/keguvu.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/xitevoxapaxumedunijurozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246a8994-757c-4f25-9503-3f796a83dc3b/99685903084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfaf8868-9776-494e-bf96-98fa97f55d1a/pilavijad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 4328 bytes
SHA-256: 4f17494ed8f8fdc37a09618900ef65e1c551b697384001f5b4c4110510e5d8cc
font_01_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 5008 bytes
SHA-256: 6c2f04ca9ec82fc7114949ab02534a9e9181a5db8c255b025794c8f9465d8132
font_02_sfnt_off00014523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14523 11756 bytes
SHA-256: 86f7ae45ef9744658012dd94e4a5a8da576c319db8e7bf23b47fdf2ca5b91535
font_03_sfnt_off00016c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C92 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361