Malicious PDF — malware analysis report

Static analysis result for SHA-256 441d242832a63ef4…

MALICIOUS

PDF

73.0 KB Created: 2021-02-20 07:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0fdf66f1e82a1f4a8af692aab5f941be SHA-1: a763e9fbd6476e0e893e988641ea8b48f5a09498 SHA-256: 441d242832a63ef490d3b5a525771824474a3eac279e23db455d93e88be2407a
164 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 are generated for SEO purposes, indicating a link farm or spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/wix?keyword=boss+gt-6+service+manual PDF link annotation
    • https://japejezapunat.weebly.com/uploads/1/3/3/9/133999519/1206437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_601637b1b0aff.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/nubukoxugaw-vamotof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5ffc2b8b6de04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/egypt_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/vimodiniwatidelitafifem.pdfIn PDF document text
    • http://rusavuwirajul.rf.gd/diet_meal_plan_to_lose_weight.pdfIn PDF document text
    • http://voferinokubusob.rf.gd/54506636988.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/mobile_ringtones_love_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/vovubodunakexef.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/annabelle_doll_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/the_chaser_full_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/pirezulo.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/oppo_a37_custom_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/balori_akhan_dekh_ke_song.pdfIn PDF document text
    • http://mujusitajal.rf.gd/anomaly_detection_machine_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/naporipenusivalexeli.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/google_java_checkstyle.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/3582071278.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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 5416 bytes
SHA-256: 2c8806d5cdc9f98ce893f65d9b26c87a652fc4c50d03429d59d50dc2c616720c
font_01_sfnt_off0000f428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 10104 bytes
SHA-256: a7a7c31ee69e76afd1777106318f4fa5034c0cde084909434c8cd8bfc9b74783

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