Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d0735e77d97d5a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-13 03:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 515cc1c8cf680a448c57bebc7c017517 SHA-1: 1a3f9828349e3d692508e1f080e4c491855b615c SHA-256: 37d0735e77d97d5abaab78d6a1efa494235863dcb1ac1b8f60c46925d16073ba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to manipulate search engine results or host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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://jacksth.ru/123?utm_term=stanislaus+county+sheriff%2527s+department+facebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478933/normal_600a7c7383f93.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/gjhjFcz/teacher_appreciation_day_october_2020.pdfIn PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/71436006ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fcc2b6267893.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/BxjgnGW/form_5_account_bab_1.pdfIn PDF document text
    • https://zatibuvox.weebly.com/uploads/1/3/0/7/130738619/zaxaliwiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60222f4b1e1a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_60200789b1b66.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/titawova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_60223c416b12f.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/jhHgfjg/pixel_art_builder_for_minecraft_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_601a0c1abe420.pdfIn PDF document text
    • https://baxezakeva.weebly.com/uploads/1/3/1/4/131406046/2959206.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481516/normal_5fe01c111672b.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/ibCiegl/misivobotijexabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_602093fe15893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 5840 bytes
SHA-256: 851d268dfbf6ea351df471f4d4c39aabc5801cb134073f9a96b87d8899fabdbd
font_01_sfnt_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 10716 bytes
SHA-256: 23e7bf9a66bf09584b674b34ea2ac545a8940423af84b1c8d4f2f0204bbce5b7
font_02_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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