Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c37b3b9dc6d1ca…

MALICIOUS

PDF

85.4 KB Created: 2021-03-24 07:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3d3857d40cfc771ec5a75a75a9bbd315 SHA-1: 1bbe9370f5cb251ff7e2f551555db6b1a6b708b9 SHA-256: d0c37b3b9dc6d1cabcaada64e6290053c75b8f6b4dace05a8709222c6b5063c8
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 0.9993

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://seumenha.ru/strik?utm_term=pra+quem+n%25C3%25A3o+sabe+onde+quer+ir+qualquer+lugar+serve PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415543/normal_5ff3dffc3682c.pdfIn PDF document text
    • https://kujuxase.weebly.com/uploads/1/3/4/5/134584075/4f5d6fd.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/uQjen4X/light_up_pvc_vine_deer_family.pdfIn PDF document text
    • http://world-wild-shop.com/569507806347v8g9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_6057a47b2371a.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/wepodiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_603673318b372.pdfIn PDF document text
    • https://jexewibovagajuk.weebly.com/uploads/1/3/4/4/134485971/2158859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_604b18f8e3b9c.pdfIn PDF document text
    • https://fetuxugov.weebly.com/uploads/1/3/4/6/134655394/3eacbc26bd.pdfIn PDF document text
    • http://djami.ru/48455461630w5dk0.pdfIn PDF document text
    • http://tradebot.space/mastering_the_mix_expose_freexq21n.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/ihhgiha/50844649757.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/JACichd/36502933317.pdfIn PDF document text
    • http://lightly.store/jumpsuit_wedding_dress_with_detachable_skirt41k16.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/eBiajgS/bike_racing_game_download_for_windows_7_ultimate.pdfIn PDF document text
    • http://secureappeal.com/master_data_analysis_with_python_githubfax8q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_096c5242df3e4bf3b4b0be8079964478.pdf?index=trueIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_9b3155b644b6414c8ca05fd3654122cc.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_20749a5d12684cdd806163c7b414fda4.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_a34727e3f84c4f3496310f16a9e0d617.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 6960 bytes
SHA-256: 526f484e3160199f67607d532ad2bc05ff62a10819a4b114ba8a4d406a6aeaec
font_01_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 5788 bytes
SHA-256: c414bab90a42cfc9206f380f2a53e6adb8a2aca7f21a1aafecd94593fd1390eb
font_02_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 3808 bytes
SHA-256: f3fcdb0b61d21726dafebd7eabfaed06f9338e8608e7a22f87fe8bf37c7ac4d8
font_03_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 13064 bytes
SHA-256: cd15f9b76f92ccd145b0aec8cfeb4b7f77435c0639c12f914967baa4af4b6a49