Malicious PDF — malware analysis report

Static analysis result for SHA-256 7633975dd3641554…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 02:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6046979d7ce584a0066c7866b8dae1ad SHA-1: ec8b83b22cf3c20b059cbb0a33a8eb79430b558e SHA-256: 7633975dd36415545466fe15910a132b260fe8c0a40e3bbcbad505408c274369
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to host malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=pacemaster+gold+elite+treadmill+manual
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/989784.pdf
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/8787715.pdf
    • http://rexapeduke.66ghz.com/38406845775.pdf
    • http://50offit.pro/59694847250hjcsw.pdf
    • http://reduslimitaly-ufficiale.website/jimexa2z7uj.pdf
    • http://juzisil.22web.org/genocides_in_history_worksheet_answers.pdf
    • http://podarokinsta.online/is_divergent_ascendant_on_netflix_usaqu7zv.pdf
    • http://getegenufiduso.66ghz.com/how_to_connect_firestick_remote_to_tv_without_wifi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_4e045e2af9af4e13978dc3045c03803b.pdf?index=true
    • https://s3.amazonaws.com/polojuliragam/namaz_translation_in_urdu_and_english.pdf
    • https://s3.amazonaws.com/jeduzizonox/24682107241.pdf
    • https://s3.amazonaws.com/vuxalirudidel/vawoguvuguxuxepajasaga.pdf
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_3c46e92acb9d475caa5f0ecadcd1d9ff.pdf?index=true
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_b4f9674337024aab9f93d6c6e1259da8.pdf?index=true
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_8cec21f72a1a49f0a73f3ff459b92661.pdf?index=true
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_baf22e1788da4634ad224c33ed58bd1b.pdf?index=true
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_d7372c250e424843a8ebf15c90ecbbd0.pdf?index=true
    • http://juwesuzibu.epizy.com/44187391498.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e682.bin
91ed1068107f52c373ff409aa4e8cf664c4650a5350f8b5b0be2672a33b4bf78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 5260 bytes
font_01_sfnt_off0000f846.bin
57cd4c4e8686c5f0cd4bbe0e055fa9bf49ca1c5517e422153b3f0be002d0fa2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10940 bytes

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