Malicious PDF — malware analysis report

Static analysis result for SHA-256 99aa75cd112bf160…

MALICIOUS

PDF

80.7 KB Created: 2021-03-19 10:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fc57093a650bb4d3dc703ae40c0c6bb7 SHA-1: bd61cfb34d3cb3e172bd2e005237e1a1aa22d117 SHA-256: 99aa75cd112bf160ed437e7267c2905589408e71df88fa7657079f26b7b21c4f
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with the primary suspicious URL being pelibifir.ru. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/wix?keyword=solubility+of+alcohols+in+organic+solvents PDF link annotation
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/4966435.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/how_to_assess_organisational_culture.pdfIn PDF document text
    • http://kdghy.online/215405196933i1zd.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/do_iud_cause_blood_clots.pdfIn PDF document text
    • http://igme.site/86836821329ufggc.pdfIn PDF document text
    • http://pedalini.club/20217034037m6cke.pdfIn PDF document text
    • http://about-central.com/elsafe_infinity_ii_manualz3sdn.pdfIn PDF document text
    • http://help-service-support.com/34128787636pj30u.pdfIn PDF document text
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/lezadufoxal.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/pawitobijurewum.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/3910699f304c3.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/7078831.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/f3a9a8f5-0de8-47f9-880d-4da029d80a9f/77252731333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e5b19a-f63a-4924-8b26-8f8a0ca75f52/gejexabowiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/what_society_is_america.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/b._ed_admission_form_in_ignou.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbc8058-b509-4715-a790-c893af9a8bb2/disobotutetujotu.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/short_english_stories_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/cds_1_2019_gk_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/mera_bhola_hai_bhandari_song_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/medizipopojokekasukap.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/50673021502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9b28a0-3db4-42f1-9930-2719fb57c3b1/zondervan_compact_bible_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/zokinamaderugasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62f0185-c911-4e00-8993-18c0ece6182d/89498750011.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_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 5548 bytes
SHA-256: 219151f033944d6e831eed0259119b8ba4e0acfba288790a55f6ba45c4e51ceb
font_01_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 10600 bytes
SHA-256: 4b37e5e548505c937420ad727dbd40db52b4c1ef1415977985addce98ff3fdae

Open this report in the interactive analyzer, or submit your own file for analysis.