Malicious PDF — malware analysis report

Static analysis result for SHA-256 9708c2b21f40a0ec…

MALICIOUS

PDF

83.9 KB Created: 2021-04-10 23:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6725cafaebc325145d33ca01c3377753 SHA-1: 997df3daa05e45ca33530e5f1bc376c6e22dff47 SHA-256: 9708c2b21f40a0ec54d8ed0b46094befc97593f033e52528c1a63f0333d94923
156 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=forgotten+realms+history+pdf
    • http://vimobewawulipiz.mypressonline.com/buzopegevile.pdf
    • http://dujaliz.iblogger.org/best_free_annotation_software.pdf
    • http://rapoxarawiwalo.sportsontheweb.net/do_pua_claims_get_600.pdf
    • http://gigezojiradof.scienceontheweb.net/penyelesaian_arbitrase.pdf
    • http://vixinusagodax.scienceontheweb.net/kovexirebek.pdf
    • http://basumoxivor.sportsontheweb.net/cicloalcanos_definicion.pdf
    • http://pigalimiru.medianewsonline.com/christmas_carols_charles_dickens.pdf
    • http://lejidakoxinetog.mywebcommunity.org/waxujonumakemogareza.pdf
    • http://gitikirazidapi.medianewsonline.com/ansys_workbench_verification_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jebokizez/vugavifikuz.pdf
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_45f6804d0e2748e983fe880d33095671.pdf?index=true
    • http://jajiwolid.epizy.com/gcse_english_language_aqa_revision.pdf
    • https://s3.amazonaws.com/kewakuko/towisewebeju.pdf
    • http://zilidezokap.epizy.com/predicate_nominative_exercises.pdf
    • https://s3.amazonaws.com/wekibik/logitech_z623_review_cnet.pdf
    • https://s3.amazonaws.com/wixatax/how_to_sort_columns_in_pivot_table_manually.pdf
    • https://s3.amazonaws.com/faxaxos/animated_love_status_video.pdf
    • http://potefedezazox.rf.gd/61153623908.pdf
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_cb6b135a521a4efb84d3d25fc429fd4b.pdf?index=true
    • https://s3.amazonaws.com/nakevoja/mafia_3_the_new_boss_trophy_guide.pdf
    • https://s3.amazonaws.com/teximikamukubo/business_math_interest_formulas.pdf
    • http://polabufu.myartsonline.com/48390622496.pdf
    • https://s3.amazonaws.com/ginutu/business_report_template_word.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_off00010869.bin
6404bb508e1e33e665bec4f830d3e07211404b86ea204939f268eda7b3b0487d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 5512 bytes
font_01_sfnt_off00011b0e.bin
9cc71ad659d56a8bb606e591a54c275d6e0dc1f9b3485d14aab9279d7820dc5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 11428 bytes

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