Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf0a638159d171a…

MALICIOUS

PDF

82.3 KB Created: 2021-04-04 09:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b157453fa4dfdb5a361ee7a85941a3d6 SHA-1: 99b5d24b32cd021ba8daaa70df12bacdc2f09c95 SHA-256: acf0a638159d171a0e5662d91eb8dbc6a02dbd4ad2e72b0a11595d311d16c036
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to unknown or disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=data+analysis+using+stata+ulrich+kohler+pdf PDF link annotation
    • https://piwozasemoxusi.weebly.com/uploads/1/3/4/3/134378412/bakewilugixesubikusa.pdfIn PDF document text
    • http://zukoretevir.medianewsonline.com/si_a_ti_te_gusta_a_mi_me_encanta_significado.pdfIn PDF document text
    • http://fasoxuxesatilu.sportsontheweb.net/31677791418.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/wudifiwugulize.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/2352959.pdfIn PDF document text
    • https://retetozatinum.weebly.com/uploads/1/3/0/7/130775023/6263051.pdfIn PDF document text
    • https://vowinerini.weebly.com/uploads/1/3/4/3/134385114/1ed6aa432150f4.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/86d72fc8.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/ebd84b08-d793-4c70-85bb-2c1af1a64e49/72343752781.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/33247081318.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/16480373295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a135bf-44e9-4872-8f11-ca6ab6400ba6/light_novel_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37a3549-0d44-4f69-b964-9a5b30131dbb/fevusezufolep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944e1c24-27cc-4d75-8295-e8d7b09b3ca7/supifupawiwipelisosiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd195b8-970c-4dd7-93b3-afb2b74714ab/what_are_the_five_love_languages_of_apology.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/photo_editing_camera_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6597009-a9fb-4b32-a261-43349d861e5e/how_to_live_a_quiet_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1ea46c-63b2-49c5-a599-37ba30c6cf92/onward_towards_our_noble_deaths_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/gevupebedazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7cca26-3e08-4a3b-9f4b-b3d019a6562c/how_do_you_pronounce_claude_monet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 5584 bytes
SHA-256: 62e681a00d5da0c8ce174d0cf3449978c9c71d07532c3641ff2a6da539fbe1a5
font_01_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 11228 bytes
SHA-256: 9bc73bc3299416e888c83b9160df60b1ae846c5ad9a55bdbe922f2d026a441ac
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf