Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cfc1b0b0102ee6…

MALICIOUS

PDF

70.5 KB Created: 2021-03-21 20:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 08b48949c28de38faf63f0df263d5ac2 SHA-1: b5bf2c8d977de2ed50c656b26dd325d1dac8c76d SHA-256: 82cfc1b0b0102ee606c3820e01d394812b6fb173331f4df6fe2022c3ce415214
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, including one to 'xezojetit.ru', disguised within a document that appears to be a medical poster template. The presence of a download button lure further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/123?utm_term=medical+e+poster+template PDF link annotation
    • http://alsamcctv.com/pioneer_vsx-521-k_bluetooth_adaptere82hq.pdfIn PDF document text
    • http://instapriz365.online/2004_dodge_ram_1500_idle_air_control_valvexrqsf.pdfIn PDF document text
    • http://tersq.space/70449440104k97y1.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/nuruvapozixix/pipisa.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/dls_profile._dat_argentina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe233bcc-671b-4e86-869b-0c79653ebe75/how_to_put_jlab_in_pairing_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50eb4ef0-582e-48bf-a6cd-ec4d2ccbc7ce/hard_bible_trivia_questions_and_answers.pdfIn PDF document text
    • https://109d6476-c6f4-4eee-b84c-907698fb4207.filesusr.com/ugd/0d7ebf_bdb1e8378c2748c5822300b337a9d4fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/rimunadekamegusiz.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_31f01cfb94e745e393b5428344f2eef5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff732930-1c23-4180-81cd-9704b83903e7/sign_of_the_beaver_summary_chapter_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed363731-b786-4ed5-a8b4-38d31787b9d8/13536386277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea5c2f7-e0e6-4f99-a65a-cbcc87c6f8de/joritopixer.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/breaststroke_swimming_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f3987f-e013-41d0-8459-414d9ed15ead/36376490234.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_4382abd86f7242319cffa4b4843b1acc.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_b71c401f77b14046a49d7133ada84cb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67745767-bf73-4212-8ea7-1e5eecd5efe7/kogewifavasemidem.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/molewipifa.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_3e06b4c417ae49488b131223c340ddca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c424beb6-a2ac-4893-a755-1cf7361bf1e9/26822193970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c85954-538e-4fdf-8b28-e33ddad2d5e7/how_to_connect_blueparrott_bluetooth_headset.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_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 5224 bytes
SHA-256: ea23c4126905b7006b527c756b829d05f74790d98f1cc0a274c8a252c719407a
font_01_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 10220 bytes
SHA-256: ed04d60b010f8f19b2fbf360354e00f1eefe31fc7f4f3abf727cf4c7882702dc