Malicious PDF — malware analysis report

Static analysis result for SHA-256 038cb4aeece59f00…

MALICIOUS

PDF

91.6 KB Created: 2021-03-01 03:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fe469ee235fbfe282528f4f50ac300c8 SHA-1: 7d7ed92d0a153d9c84192d0648a7d5fba3c69efe SHA-256: 038cb4aeece59f0049e3c580796fa648ced14d345227f7de990c7134c16f1302
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://leonvi.ru/wix?keyword=kirby+fan+games+unblocked PDF link annotation
    • https://cdn.sqhk.co/latusetime/cWAVCjj/memes_wars_2.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/wakesa.pdfIn PDF document text
    • http://lastmarkt.ru/96395634430nm0y0.pdfIn PDF document text
    • https://kinotadi.weebly.com/uploads/1/3/1/6/131606109/ac65a14b.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/for_a_given_job_the_direct_costs_associated_with_the_job_are.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/jasokabujikova.pdfIn PDF document text
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/84b8bbf66.pdfIn PDF document text
    • https://sukigemanewa.weebly.com/uploads/1/3/2/6/132681928/1320634.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/rgmTyji/minerals_examples_food.pdfIn PDF document text
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/josuv.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/f5e30be53cf2e41.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/the_merchant_of_venice_summary_act_1_scene_3.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/622031279483vdvt.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/mNdjjje/xunagafojagevabajo.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/1336528.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/yS2eqjg/big_container_ship_simulator_2019_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/ce1ibgh/business_analyst_certification_for_beginners_online.pdfIn PDF document text
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/802b79e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodedewezijore.atwebpages.com/1999_international_4700_dt466_specs.pdfIn PDF document text
    • http://roveramo.atwebpages.com/11901410244.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/hpe_storeonce_cli_reference_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/92437003212.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 8280 bytes
SHA-256: 112f6786a120800f301fda9a4f68c88b66edb4c829d613ef695e9360e37d0fb1
font_01_sfnt_off00012728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 5616 bytes
SHA-256: e81c5a9c810d4579790402da7117b952487e7ce8a540e01af26e3ca3da95eb28
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 11284 bytes
SHA-256: fcd09b8f903046014cee170241d4fd6f50856eaf266b1506dae722794d699702