Malicious PDF — malware analysis report

Static analysis result for SHA-256 938c2c33051da183…

MALICIOUS

PDF

81.8 KB Created: 2021-03-25 00:25:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 053daa1607030debc8258495c3fc17f2 SHA-1: bde9fd2696c3a9e4c5efe29e6ac0cce4ab1cb913 SHA-256: 938c2c33051da183d4af9902efa93868b03ae79813b79554a8cd7f9e022789ff
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains and appear to be part of an SEO link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic further support this, suggesting the document's primary purpose is to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://druttle.ru/strik?utm_term=how+to+study+the+quran PDF link annotation
    • http://center-about.com/uefa_champions_league_schedule_tvwh8u5.pdfIn PDF document text
    • https://duvafoxugijotad.weebly.com/uploads/1/3/5/3/135305538/rojozebetexafera.pdfIn PDF document text
    • http://izzzaaa.space/exsultate_justi_john_williams_sheet_musicrp49q.pdfIn PDF document text
    • https://famexowizesiz.weebly.com/uploads/1/3/4/3/134359716/d0c2e27e1b77.pdfIn PDF document text
    • https://guverududilo.weebly.com/uploads/1/3/6/0/136086053/xurewosinez.pdfIn PDF document text
    • http://mx50off.pro/71875121473qsfix.pdfIn PDF document text
    • http://elinekici.online/zazanigujilewezilonemarijxqyzo.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/5c9f6f07d.pdfIn PDF document text
    • http://avto-document.site/7_highly_effective_habits_of_a_teenager_summaryrws49.pdfIn PDF document text
    • https://fivomatimib.weebly.com/uploads/1/3/1/0/131070631/2514452.pdfIn PDF document text
    • http://fortysgjdk.fun/59116231650xy3lt.pdfIn PDF document text
    • http://sodaapp.pro/stealth_cam_qset_settings7kpld.pdfIn PDF document text
    • http://sputnews.com/coursera_r_programming_week_1_quiz_answersvxehw.pdfIn PDF document text
    • http://idealica-tufficiale.website/2189157841314fqg.pdfIn PDF document text
    • http://getveran.site/navy_counseling_chit_for_being_lateugpp5.pdfIn PDF document text
    • http://pelistens.xyz/88905326820c6xoa.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/bepukuba/excellence_resort_dominican_republic_el_carmen.pdfIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_7a92f8bb21c54feab63bc82e8b71d0e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/56640083176.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/darebex.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_494e94d353904024814f23c5056286a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/84474431626.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_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 4996 bytes
SHA-256: 69dde3ecb6b962eef2ebc97f7ed241ee127cba870b43f9eb0affa885e9453686
font_01_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 10980 bytes
SHA-256: 6e6fcb45f0f9d96e367121ab0bbf17ab316eb92631d3c561ca4a6a22725b9551
font_02_sfnt_off00012a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A00 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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