Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9b167f8c9daff1…

MALICIOUS

PDF

85.3 KB Created: 2021-05-19 11:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a61326e72e1113189c79a6052e4002e1 SHA-1: 21a18f60b5d943c7de0a3f1e9cc3fcf1b3400348 SHA-256: 8d9b167f8c9daff1f716a0a6d197daf6fc509fc6ebebc410e9e4834ed19cc163
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data T1059.007 JavaScript

This PDF document is classified as malicious and exhibits characteristics of a credential phishing lure, specifically targeting USCIS form completion. The presence of a large number of external links, many pointing to PDF files hosted on file-sharing services, suggests a link farm designed to distribute malicious content. The heuristic 'SE_MFA_LURE' indicates the document likely attempts to harvest multi-factor authentication codes or session tokens, a common tactic in sophisticated phishing attacks. No scripts were extracted from this sample, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://dafemum.ru/strik?utm_term=how+to+fill+out+uscis+form+i-90
    • https://nudozulewofofij.weebly.com/uploads/1/3/4/7/134711849/fidixiri.pdf
    • https://gebowajawuma.weebly.com/uploads/1/3/4/5/134582097/gekezafipo.pdf
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/4880020.pdf
    • http://pezisafepogux.22web.org/55814471262.pdf
    • https://pimidunobesuxig.weebly.com/uploads/1/3/0/9/130970022/vawigelijim_xuzubutibake_dorenamodofeku.pdf
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/ponuguranule.pdf
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/wagaxule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pibusobi.epizy.com/majoragaranunirujoduz.pdf
    • https://s3.amazonaws.com/gagagakigibapo/independent_auditor_s_report_2018_template.pdf
    • https://uploads.strikinglycdn.com/files/17ee5cc3-7ce4-4be7-87a5-fce0b422613e/can_i_use_an_immersion_blender_to_make_smoothies.pdf
    • https://uploads.strikinglycdn.com/files/045c6e34-0d33-48ee-924c-73fccba06f02/the_holy_quran_download.pdf
    • http://tasopawak.rf.gd/kifodinifowo.pdf
    • https://s3.amazonaws.com/tigewibejageju/gisukuzikifi.pdf
    • https://uploads.strikinglycdn.com/files/d316b81d-8091-4e24-bfa5-dc444ea1fc1c/how_to_say_sorry_to_a_friend_after_a_long_time.pdf
    • https://uploads.strikinglycdn.com/files/df06eaf4-120b-4dfc-ad6d-d0b38466995e/88222475946.pdf
    • http://nekonopevijaj.rf.gd/audiovisual_translation_subtitling_volume_2.pdf
    • https://uploads.strikinglycdn.com/files/e6ee2a51-aa61-4b04-8fed-072accd02fa7/gebomodutatogasogipiki.pdf
    • https://uploads.strikinglycdn.com/files/1551a79b-27eb-4413-b2db-bf1c817b0ce7/94_honda_accord_ex_for_sale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c8.bin
291248f1f2b86636d5b1ff8d66a88a57a5e0a8ff71d3b22f3c510a1b9d02be3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 4856 bytes
font_01_sfnt_off0001145e.bin
e686a84bfdd79f1db5498d7f69f31f93ecab6e1198e67f7025158b57dd1bcd02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 10980 bytes
font_02_sfnt_off000139b4.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 4324 bytes

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