Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf9bd627dd40b31…

MALICIOUS

PDF

81.7 KB Created: 2021-02-25 17:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e735586757e1d02a0f42d5b6b60fe31a SHA-1: a103e1bdc98803bd4f9956aed5adc3a5c5e5c2e9 SHA-256: aaf9bd627dd40b3157bbdf5ffa81621e273b4f7f5a83f03a27711a42a5d17575
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body is obfuscated but contains keywords related to a service center search, indicating a lure. The presence of PDF-specific heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, along with ML and ClamAV detections, strongly indicates malicious intent, likely for phishing or malware distribution.

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://baarspo.ru/strik?utm_term=eureka+forbes+vacuum+cleaner+service+center+bangalore PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fc7e4191f624.pdfIn PDF document text
    • https://biputivaninude.weebly.com/uploads/1/3/1/4/131438500/fujumafileguka_tinoxel_zabezos_jijeloxo.pdfIn PDF document text
    • http://meriline.store/mitus8kq4s.pdfIn PDF document text
    • http://twenty-promo2020.ru/tswr_jc_cet_2019_results6ej8p.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/6807423.pdfIn PDF document text
    • https://pazudafodimaje.weebly.com/uploads/1/3/0/7/130776249/gixis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5ffb3effce60d.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/xilibu.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/dudidelevemeb_fujawuwakinize_zatasivizilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_602e7fe8de857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421776/normal_5fed082dc75c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_6036d7c91b72b.pdfIn PDF document text
    • https://rizenuwav.weebly.com/uploads/1/3/4/3/134335920/pojokageku.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/7586838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bajewilogofiro.epizy.com/bulbous_crawler_guide.pdfIn PDF document text
    • http://nuzejotegaze.rf.gd/cad_soft_tools_to_dwg.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/avant_browser_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/wallpaper_hd_3d.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/75350757607.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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5304 bytes
SHA-256: a3aad29f8682e690c52814ca4b402b04e794216c56655bbb8478dd7f7436e7f8
font_01_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 14724 bytes
SHA-256: d066aced1d59c04fc45ce1fbe02804caf7251ee7445d25b5a8eb396818599c47
font_02_sfnt_off00012a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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