Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f70d7eb88ac6063…

MALICIOUS

PDF

75.3 KB Created: 2021-04-05 08:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ff41b0e44d3d2a9750c9fe7efebbc1de SHA-1: 264c8e38814fb484a582ac39df2a9b1f98747fee SHA-256: 8f70d7eb88ac60630cef3f529b59654bf2db08cba077d736159188c963bef2bb
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with a primary focus on SEO manipulation or phishing. The document body, though partially corrupted, suggests a lure related to 'Grasa corporal definicion pdf'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=grasa+corporal+definicion+pdf PDF link annotation
    • http://laxuribotu.iblogger.org/will_movie_maker_work_on_windows_10.pdfIn PDF document text
    • http://rollernefritmassage.xyz/rosamojebitogumobadimotbak.pdfIn PDF document text
    • https://kolabobinojojiv.weebly.com/uploads/1/3/4/8/134880551/gozewa.pdfIn PDF document text
    • http://neip-forum.fun/2806012937112afs.pdfIn PDF document text
    • https://nuwurabe.weebly.com/uploads/1/3/4/4/134477198/gajonufivi-zogupinefirepu.pdfIn PDF document text
    • http://slimitalia.space/34386768666zhubb.pdfIn PDF document text
    • http://crubr.space/gonuxafemonirelevazegedouf5yb.pdfIn PDF document text
    • https://lojapajarete.weebly.com/uploads/1/3/4/5/134521209/juvuvose.pdfIn PDF document text
    • http://lifegirls.site/33885615897ccx3c.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/93e8e21b-c846-49f4-8926-1fb201dc2082/kapamipimixibave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2a2882-78bd-4fa1-ae7c-f45c3150cd2d/waterpik_water_flosser_wp-150_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d5b772-3412-4226-86f5-99316d26cda3/23353711471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fc7dd2-7ee1-4a24-9554-a819b01ee51e/4th_grade_reading_fluency_passages_with_word_count.pdfIn PDF document text
    • http://kalumeli.rf.gd/zuxewupizarixofujuxivaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0afb240-9afd-4a58-bf57-0f85481a9210/70449915713.pdfIn PDF document text
    • http://nosodete.epizy.com/pointage_antenne_canal_plus_afrique.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_fd5f86c4f75e4991b723157659567e1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a83cdb-9708-4934-a96b-c88b2e1946c5/enfermedades_que_afectan_sistema_endocrino.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_543c0d97f2184c88a817b2271ad2e444.pdf?index=trueIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_467638e7b8e74e0488ee16af63cc6701.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f7b9b2-dd93-49ea-aa10-c2a3c25176c2/char_broil_big_easy_infrared_smoker_roaster_and_grill_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2096fca9-60e5-4099-9bad-b1fa87ba1a09/vagumugazasiwagevubuwis.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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 5180 bytes
SHA-256: c572fe722d0a7dfb7513ff1e20457e25cdb0a58e40a9bab6f351ce0bdebdbe4c
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 11620 bytes
SHA-256: 7c8fbfe48003d3b205fbde4d0b5b4ca6076a75ef4b4734e728a12bed13d27cd3