Malicious PDF — malware analysis report

Static analysis result for SHA-256 386789c02c22390b…

MALICIOUS

PDF

100.9 KB Created: 2021-05-16 23:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e94a00eb39f016d807ed89462523eccb SHA-1: b1525d29e6d0fbc61d2ed5e632c5c2b6f44f758e SHA-256: 386789c02c22390b467ae7c45a8d01c778df944efe3c16106a2c551b3b025695
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=la+cura+frankie+ruiz+mp3+download PDF link annotation
    • https://cdn.sqhk.co/rabataxuvax/jd5s2g7/carx_drift_racing_online_xbox_one_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/v3zQhfb/era_of_warring_states_naruto_episode.pdfIn PDF document text
    • https://cdn.sqhk.co/sinupupuzaxa/gjifiaz/53290043395.pdfIn PDF document text
    • https://wawuzaxuluzu.weebly.com/uploads/1/3/7/5/137508639/mokam.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/gc0KIh0/naxafaxerogijum.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/tajedajarovit_tumoxibaso_forez_woxokewi.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/fonixedot.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/sepawi/security_manual_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b20429f-1753-4e16-91e6-0efa40d846aa/95252763500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdcbd50-f7c2-4bef-8875-cb883a754e08/kujarikuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b076b2d-4336-4e97-8e10-82aa10b0d527/8275587152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c69bc6d6-f100-4a0c-af75-49c07b68e6ab/4_marketing_management_philosophies_examples.pdfIn PDF document text
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_095c811873be4e41a9c1bcae1cf2fbe2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/57465933629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1652e0-0622-4aef-b277-6d9f0c3433a6/rewetuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147eaac1-6c32-496d-913a-fa82b6255e1b/fl_studio_12_all_plugins_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17299ce6-14da-480c-87e7-f59ed774fceb/health_systems_engineering_masters_degree.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0a1122-acd4-433b-b5f8-4dcf6bc44abe/dd_5e_feats_wikidot.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_e4c8b745e1b24dc293ebf333007989af.pdf?index=trueIn 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_off00014a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A86 5436 bytes
SHA-256: aaa63fefa83947f0e678290b3af3e56d5c7b5879c83d23a6816a34e9d94ae2a3
font_01_sfnt_off00015d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D12 12100 bytes
SHA-256: c8ef10e577841c2ec11cfcd5309508b92a79f976f85464b9161be03692377f94