Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e7343b16e735a7…

MALICIOUS

PDF

68.4 KB Created: 2021-02-24 10:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a66259c3a575c8b1d70ee0eb26b547d5 SHA-1: 66e49df3a454e3edbe86c473c34b7f8938872f69 SHA-256: a2e7343b16e735a7a571ea818cd95cc52c056f231b7f6cc36780e410ae44e9d0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO-optimized PDF files, suggesting a link farm designed to drive traffic to malicious sites. One prominent URL, 'https://baarspo.ru/strik?utm_term=does+keurig+make+a_reusable_carafe_filter', appears to be a lure for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=does+keurig+make+a+reusable+carafe+filter PDF link annotation
    • http://kirunag.66ghz.com/fezorudikugakexog.pdfIn PDF document text
    • http://peludofnor.fun/nclex_infection_control_study_guideb4xte.pdfIn PDF document text
    • https://gagodizuw.weebly.com/uploads/1/3/5/9/135965264/99f8aaea15e16.pdfIn PDF document text
    • http://1fps.ru/68550019131maoz2.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/jazuravazaguz/how_to_measure_timex_watch_band_size.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/71729157373.pdfIn PDF document text
    • http://vonikolodu.rf.gd/51379682446.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/formica_laminate_basalt_slate.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/jazz_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/wubobuxosebipe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC320 5180 bytes
SHA-256: fa3bf77a158720218ea600f371d3080487192bd7b8234116aac99b575402ddb1
font_01_sfnt_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 9924 bytes
SHA-256: faa4f088de942db218a06232f1b4f2bbff569885cb07f19f746ba12106bb7f75
font_02_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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