Malicious PDF — malware analysis report

Static analysis result for SHA-256 7763aa88abb295e7…

MALICIOUS

PDF

86.4 KB Created: 2021-03-18 21:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 303434497ff7cc1c7cab230dd9d044be SHA-1: a56edd92b3366dceff3e05bc9a576b47095e5155 SHA-256: 7763aa88abb295e743385b511f140a11335a4b1a875cf1914abd66f798cf9124
156 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 of which are generated in a SEO-farm style, suggesting an attempt to manipulate search engine rankings or drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/award?keyword=backward+caste+list+in+telangana+pdf PDF link annotation
    • https://lasirobazu.weebly.com/uploads/1/3/4/3/134399905/979238f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393364/normal_5ff261e6db76f.pdfIn PDF document text
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/7468929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_604932613e963.pdfIn PDF document text
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/77fae4.pdfIn PDF document text
    • http://gejopuzebizovuk.iblogger.org/power_of_attorney_act_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486965/normal_5fee2e6f3d09d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419191/normal_600a507857f80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5fff225838875.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
    • https://s3.amazonaws.com/zarusegibitumet/hanuman_chalisa_telugu_ms_rama_rao_download.pdfIn PDF document text
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_7ec1a2fbf9054437b5f4c1941aa50fe9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/capture_one_pro_11._3.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_0aad1855081641efa458451400a029b6.pdf?index=trueIn PDF document text
    • http://fukanabe.epizy.com/printable_embroidery_stitches_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/fibejutamupe.pdfIn PDF document text
    • http://fogomagof.epizy.com/sirijojukafofukese.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/xuvavupaxidusanowisen.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_9ddb15689ed840249b22a58bb6a2e48e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujixus/timesheet_hours_calculator_uk.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_02c8174cab1e4637ba5b402883b0a2c3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 5208 bytes
SHA-256: 96183b7cb55e653bae750578de6b2e181f086f0491a51cc1760cd1bef20c898d
font_01_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 11448 bytes
SHA-256: e306992c2a9fc3f79325486db9246fa7d9a5067f4e31e9bd2d92389ce15d46ef
font_02_sfnt_off00013dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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