Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7df35b9602d6e2e…

MALICIOUS

PDF

75.9 KB Created: 2021-02-09 10:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: efe85925a92cb165009eb9f18457adf8 SHA-1: 596a8a94132b386a8db4a6b93bccd4508276a065 SHA-256: d7df35b9602d6e2e85d6f68ef8b6dc77805b7c2790ab74cdded8c940879de893
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic specifically identified a mass external PDF link farm. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=angry+bird+transformers+apk PDF link annotation
    • https://xajaxosu.weebly.com/uploads/1/3/5/3/135304217/2295164.pdfIn PDF document text
    • http://naremegefo.iblogger.org/autumn_leaves_sheet_music_bass_clef.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/zuzoba_nibalaziminexo_juzamojut_sagep.pdfIn PDF document text
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/venujupudoje-vefow.pdfIn PDF document text
    • https://gewolurigidanax.weebly.com/uploads/1/3/1/3/131383018/mowonakudodanuf-zanup-vujupudoneve.pdfIn PDF document text
    • http://reduslim-eu.site/gukoperemogekoluxuxelewtboax.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/zidijiw_tewipadibus_fovivolu.pdfIn PDF document text
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/wakuzogosamaliz_golerawijofa_rexojogi_ronitasejep.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/legoval_tenipegetoxu_gudasugufuzive.pdfIn PDF document text
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/dc4a0e3.pdfIn PDF document text
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/9792637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nalifij/vavuvinegidopoduwidepi.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/51182715884.pdfIn PDF document text
    • http://pakoxerevigere.epizy.com/tejoveparoromeveluwemi.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/afcent_reporting_instructions_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/javopo.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/polaroid_picture_size_template_psd.pdfIn PDF document text
    • http://fuxufotab.epizy.com/93500039774.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/ap_chemistry_review_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/bucket_elevator_capacity_calculation.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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 5624 bytes
SHA-256: ac67fee44441df7e292a9e6888e852c0e0d4a1764737c51e2816536d0b613c4e
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10544 bytes
SHA-256: 1d5b3c947abe78fa375c63351090cd88277ebca75427066a1a26ce8347d5464a

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