Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df479f22dd8088e…

MALICIOUS

PDF

73.7 KB Created: 2021-04-04 16:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b6c37841c69e6567033b15ae3c732041 SHA-1: 724cd2f327d38b58e6b5caac418958c6b3f540fb SHA-256: 9df479f22dd8088e14b1f854408b6b07cfb0b909319883f269dece35039d567a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://fokemale.ru/award?keyword=authorization+letter+to+process+documents+pdf PDF link annotation
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/5852580.pdfIn PDF document text
    • https://lebiranewedeto.weebly.com/uploads/1/3/4/5/134595514/jazifo.pdfIn PDF document text
    • https://fulitadu.weebly.com/uploads/1/3/4/8/134863398/b9be573ac9.pdfIn PDF document text
    • http://afracheat1.xyz/sudo_command_in_linux_with_examplesej91x.pdfIn PDF document text
    • http://cashbackmoney.info/latisipagidemegisopideruyuc40.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/letexegi.pdfIn PDF document text
    • http://digitalmicroteter.xyz/cateye_quick_wireless_cycle_computer_manual5hm92.pdfIn PDF document text
    • http://comforfemj.fun/77823347054egqku.pdfIn PDF document text
    • http://7lessons.fun/klh_windsor_12_powered_subwoofer_-_black_oak81sgl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovudefimure.rf.gd/jurnal_sistem_reproduksi_manusia.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/how_to_interpret_rune_stones.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/dell_u2913wm_vesa_mount.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/spinal_cord_injury_rehabilitation_guidelines.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_3b42ea9dc2844810b79698f15dd3c731.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/can_i_day_trade_options_on_webull.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/4777806663.pdfIn PDF document text
    • http://gidiruroxab.rf.gd/47737835821.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/zigujenuz.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/anjaniputra_kannada_movie_songs_w_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/kuwesugoxinatonanodef.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/48771112214.pdfIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_6c1096521d164d05a727c59881666eb2.pdf?index=trueIn 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_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 5432 bytes
SHA-256: 43ddf0116699987b74d4ebaded9d6741088e723dca8505d8facd9cc371d8a38c
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 10224 bytes
SHA-256: e79d989e75fd370ff38930ea87fde1b2d9f91196f53ddba959f7737c78b1748c

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