Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d3f73c21979ef1…

MALICIOUS

PDF

79.6 KB Created: 2021-03-27 18:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e84868c26eb133a2edbdce7cc36cbb9 SHA-1: 94dc915ba33fc8c809566f97df017ae01143e484 SHA-256: a9d3f73c21979ef1b4318bdb8c870aa5c3ffa82cb20b35b06883c9f0d6b516e1
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what+is+putting+on+the+full+armor+of+god PDF link annotation
    • http://alternativeinfluencenetwork.net/56266425808ubf2w.pdfIn PDF document text
    • https://zixamagexiwu.weebly.com/uploads/1/3/4/0/134012381/f3bb2758e5a59a.pdfIn PDF document text
    • http://kamini33.ru/how_do_we_use_progress_in_a_sentencegp13c.pdfIn PDF document text
    • https://tivofemexire.weebly.com/uploads/1/3/4/0/134012880/xosonife-zojoxolixejiwoj.pdfIn PDF document text
    • http://creditscoreusa.info/duzupuwuduruposejarfe6a.pdfIn PDF document text
    • https://zifimegepero.weebly.com/uploads/1/3/4/6/134601706/2753178.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://s3.amazonaws.com/fujadabez/how_to_apply_psychoanalytic_theory_to_literature.pdfIn PDF document text
    • http://rowesotinik.rf.gd/toboliliza.pdfIn PDF document text
    • http://tadigolunus.rf.gd/12746683731.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/grammar_checking_software.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/time_to_file_answer_to_complaint_pennsylvania.pdfIn PDF document text
    • http://ferodokibaw.epizy.com/sokepobunilaregu.pdfIn PDF document text
    • http://vumopigaw.epizy.com/fenukomulix.pdfIn PDF document text
    • http://waweparijom.epizy.com/tabobigadipukilufupak.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/siwutinitigelibajopizo.pdfIn PDF document text
    • http://lulojoduvos.epizy.com/3032861963.pdfIn PDF document text
    • http://duzewinabo.epizy.com/jaxirapenotuvonuwexiwab.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/duralast_jump_starter_750_charging_cord.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/alone_together_cast_freeform.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/arcade_games_free_for_windows_8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 5348 bytes
SHA-256: 627e71680df0ac319298eceb82257e1b781cce48679a3dc9ec166e7939b0ce64
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 10320 bytes
SHA-256: b78f98062e2fc2746aea6899e70b1cc52c4792c13514ebccd9ffa36a0c940996
font_02_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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