Malicious PDF — malware analysis report

Static analysis result for SHA-256 460c1153cb14d991…

MALICIOUS

PDF

80.7 KB Created: 2021-05-12 20:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eb498511a8042cdc596b99432dd5a730 SHA-1: 22b3e8be10843585e0f0d8f61fc9418298da7cd3 SHA-256: 460c1153cb14d99124ea9cb1d64c04bd56234ed1dc77fe6e761da9819a0d73a3
186 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan threat. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=what+is+the+longest+essay+ever+written+in+history PDF link annotation
    • http://speak4pro.com/minabovibubuluxuvimu3qdx6.pdfIn PDF document text
    • http://max-lifting.store/batiwexiyfcfj.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/LZjcifB/best_drought_proof_grass.pdfIn PDF document text
    • https://narimokilef.weebly.com/uploads/1/3/4/6/134603618/3264919.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/zadorevigejafozaki.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/jaCYie7/pilot_rollerball_pen_amazon.pdfIn PDF document text
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/kakopetebaxo_dilibazipi_xediduladenos_jeniregub.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/hS6AcPS/cod_black_ops_cold_war_zombies_reveal_date.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/junubumu_baguvigakagalo.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/guvebogotem.pdfIn PDF document text
    • http://gutprod.xyz/top_digital_marketing_podcasts_2020e50su.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc251a7-0186-4ca8-92ed-4ebe3d4a24fc/kevaralujijif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c0b0e4-49bf-4e3f-ae21-fe36df6ab7be/food_safety_modernization_act_produce_safety_rule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb19ebc-2836-42da-9359-bf1c9bb8f587/how_to_clean_the_filter_on_a_dyson_handheld_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63284f1c-b5ca-4a3d-b075-81c83601d895/68189660013.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/99619259011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e65bbcc-2085-45ec-9d25-5f712a549ccd/85879613106.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/interactive_science_textbook_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/xexevabusomatesavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ce1e51-9d1f-4aa2-9c96-dc5a7584044c/how_to_remove_drip_tray_from_whirlpool_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/5_paragraph_essay_outline_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd02ec2-7644-4b23-a304-fca755b2bd34/killing_floor_2_weapon_stats.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_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 5212 bytes
SHA-256: 999c003de3873ebcb33e22823d1a1293bcdfdccae402e7a11adb0afd3604d390
font_01_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 10796 bytes
SHA-256: ea39e33eda0fcbac3c38dca7971e9a499d4a4c7140f48981501c337c95a46d78