Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f62c055d7ade94c…

MALICIOUS

PDF

79.3 KB Created: 2021-05-22 23:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a30e6408a8fd19bff98805af32c7fd24 SHA-1: 2a84bd71686c3d7a08406325a5737da9a9a09ecc SHA-256: 7f62c055d7ade94ce19ece79a19a03867e78639814bf87b2c3da9ede7100eb3c
194 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple external URLs, many hosted on disposable domains, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the presence of embedded URLs and the heuristic findings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=jbs+human+population+worksheet+answer+key PDF link annotation
    • https://pomonomiwubexi.weebly.com/uploads/1/3/2/3/132302815/fezirezi.pdfIn PDF document text
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/1028792.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/9706163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_5fd16e2f6d4e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fc85e8f8b738.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/lunefew.pdfIn PDF document text
    • https://reviniwixex.weebly.com/uploads/1/3/1/4/131407974/gaxil-lemelejewevipar-rujexowis.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/pudaxazude-liredaga-dupuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_604d8867b92bc.pdfIn PDF document text
    • https://tejojobowadame.weebly.com/uploads/1/3/0/8/130874570/davurokonojekedoto.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/4129639.pdfIn PDF document text
    • https://mubikobilowopo.weebly.com/uploads/1/3/0/9/130969089/gekiwub_fivowojanamago_palilowesuwo_babuzofujof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_601df3f8cb4a6.pdfIn PDF document text
    • https://kedabivaj.weebly.com/uploads/1/3/1/4/131438143/7950048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_5fd8ba3a41a6b.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/551184.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/f169ce5c-0aa8-4ce5-b14d-ebdc8a12785e/43800665136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ad4fa0-5ee0-4442-99a1-7e668188b638/how_to_install_focusrite.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/how_to_clean_total_comfort_top_fill_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d17674c-a1f7-4914-9477-7de7fe3359ea/ponexinizumo.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/crusaders_rugby_logo_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/how_do_i_get_an_eircode_for_an_address.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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 5444 bytes
SHA-256: 57ac5e7fb96b73dd6788bf67da0690e6fd19d177764f1027450cd54ff57ed0dd
font_01_sfnt_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 11324 bytes
SHA-256: 845e81ea449366b779b7a70b95a8155242cee1d178ad2a35ca186743ef811ad1