Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda87167f8811211…

MALICIOUS

PDF

87.2 KB Created: 2021-05-02 03:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 37e9bfae3667b7082de52de2645abe50 SHA-1: df9cef56025aa4ab0d6d16619e491efa0ede9126 SHA-256: bda87167f8811211e52e04b45125bee41c1aeb6f7fbe93ec12500bbe0a1f5899
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=how+much+does+a+heater+exchanger+cost PDF link annotation
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/3500479.pdfIn PDF document text
    • https://sujegido.weebly.com/uploads/1/3/4/6/134695044/pereji_larururipo_rorogidefitat.pdfIn PDF document text
    • http://danoguvu.medianewsonline.com/sizojutavomisanonefifa.pdfIn PDF document text
    • http://wuramegojuluz.mywebcommunity.org/65823232674.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/vigunevaneganiz-gixogoxidizu.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/pesatawu.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/ae0dcccf-0c5d-42d2-861f-7a12c56c62e2/pakovegufa.pdfIn PDF document text
    • http://mukovixajetunex.epizy.com/vugapojunupezaregi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32f4efa-8c7d-4583-aa6f-5ba4a481ecaa/is_sonic_cookie_dough_safe_to_eat.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_1adaa9c143d542579a4334ca8f3186f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c881699c-5c92-4c17-9301-135ca005d6fd/multiplying_decimals_by_whole_numbers.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_d13903614571403f90b8b1109e9f4c65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f740558-d3c5-446e-a5cb-944fca604e45/juxasenametix.pdfIn PDF document text
    • http://tejozusob.rf.gd/33378944272.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/bestiary_6_link.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_73f7c648ea254f389a9b43c498a1c5ac.pdf?index=trueIn PDF document text
    • http://nozanela.epizy.com/jisub.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_1f73a64e251e47cc839eb573b3052a30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/553ba012-dde0-481c-b61c-3998f06f4e51/53295811530.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_3ebb2c3d4f264e91bde498dce40af72b.pdf?index=trueIn PDF document text
    • http://xutenujute.myartsonline.com/38280577133.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/xatemavakogulika.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_31bc84e7489b4c39b62ee23c3f336e3b.pdf?index=trueIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_2a5b41375dc547cf9ac7b02a762946f2.pdf?index=trueIn 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_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 5444 bytes
SHA-256: cecbfead44eb9833eb2f46bc459032106eb0108903af8b666308387b6a6cdcec
font_01_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 11480 bytes
SHA-256: c0da19f81c8a60c96560d0e4d53bfb85b9977e667238336ac86ff901e1b4d430